Patent Publication Number: US-2022227264-A1

Title: Rotating device for vehicle interior item, and rotating device for vehicle seat

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is the U.S. National Stage entry of International Application No. PCT/JP2020/021399 filed under the Patent Cooperation Treaty and having a filing date of May 29, 2020, which claims priority to Japanese Patent Application No. 2019-102647 having a filing date of May 31, 2019, Japanese Patent Application No. 2019-125481 having a filing date of Jul. 4, 2019, Japanese Patent Application No. 2019-218991 having a filing date of Dec. 3, 2019, and Japanese Patent Application No. 2020-076526 having a filing date of Apr. 23, 2020, all of which are incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present invention relates to a rotating device for a vehicle interior item that includes a base member that has a rotation support part, a rotating member that supports the vehicle interior item, is rotatably supported by the rotation support part, and is disposed above the base member, rotation-locking means that enables the rotating member to be switched between a rotatable state and a non-rotatable state, latching means that is provided on the base member side, and engagement means that is provided on the rotating member side and can be switched between a state in which the engagement means engages with the latching means when the rotating member is in the non-rotating state so as to suppress detachment of the rotating member from the base member and a state in which the engagement with the latching means is released when the rotating member attains the rotatable state, and to a rotating device for a vehicle seat in which the vehicle interior item is a vehicle seat. 
     BACKGROUND ART 
     A rotating device for a vehicle seat in which a rotating member supporting a vehicle seat as a vehicle interior item is rotatably supported by a base member, engaging a lock pin on the rotating member side with a lock hole on the base member side when the rotating member is not rotating restricts rotation of the vehicle seat and also suppresses detachment of the vehicle seat when a large load acts on the vehicle seat, and when rotating the rotating member, that is, the vehicle seat, disengaging the lock pin from the lock hole releases the suppression of detachment and enables rotation of the vehicle seat is known from Patent Document 1. 
     PRIOR ART DOCUMENTS 
     Patent Documents 
     
         
         Patent Document 1: Japanese Patent Application Laid-open No. 05-330371 
         Patent Document 2: Japanese Patent Application Laid-open No. 2010-173491 
         Patent Document 3: Japanese Patent Application Laid-open No. 2004-123044 
       
    
     SUMMARY OF THE INVENTION 
     Problems to be Solved by the Invention 
     &lt;First Problem&gt; 
     Accompanying an increase in the elements necessary for a vehicle seat in recent years, a reduction in the size of the vehicle seat is required, but in an arrangement that includes detachment suppression means as disclosed in Patent Document 1 above, the height tends to increase by a proportion corresponding to the detachment suppression means, and there is therefore a desire for an arrangement that can prevent the height of a rotating device for a vehicle interior item such as a vehicle seat from increasing even it includes detachment suppression means, that is, a desire for solving the first problem. 
     The present invention has been accomplished in light of such circumstances, and it is a first object thereof to provide a rotating device for a vehicle interior item that can solve the first problem by enabling an increase in the height to be suppressed while suppressing detachment when the vehicle interior item such as a vehicle seat is not rotating, and to provide a rotating device for a vehicle seat in which the vehicle interior item is a vehicle seat. 
     &lt;Second Problem&gt; 
     Furthermore, a vehicle seat device that includes a rotation mechanism having a rotating member having mounted thereon a seat cushion frame supporting a seat cushion and a base member rotatably supporting the rotating member from below, and making a seat rotatable with respect to a floor is known from Patent Document 2, etc. 
     In order to facilitate operation of the rotation mechanism disposed beneath a seat cushion, the entry of foreign matter into the rotation mechanism should be avoided as much as possible, but Patent Document 2 does not disclose a structure that can solve the second problem, for example, one that suppresses the entry of foreign matter into the rotation mechanism. 
     It is a second object of the present invention to provide a vehicle seat device that can solve the second problem by suppressing the entry of foreign matter into a rotation mechanism. 
     &lt;Third Problem&gt; 
     Moreover, a vehicle seat device that includes a seat cushion frame supporting a seat cushion, a rotation mechanism disposed beneath the seat cushion frame while having a rotating member supporting the seat cushion frame and a base member rotatably supporting the rotating member from below, electrical equipment, and an ECU for controlling operation of the electrical equipment, wherein the rotating member is supported by the base member so that it can rotate in response to operation of an electric motor, is known from for example Patent Document 3, etc. 
     In a vehicle seat device that includes electrical equipment such as an electric motor, in order to ensure there is space for disposing an ECU controlling the operation of the electrical equipment, there is a third problem that the height of a seat cushion increases, and there is a desire to avoid this. 
     It is a third object of the present invention to provide a vehicle seat device that can solve the third problem by enabling any increase in height of the position of a seat cushion due to disposition of an ECU to be avoided. 
     &lt;Fourth Problem&gt; 
     Furthermore, a vehicle rotating seat device that includes a seat frame supporting a seat main body, a rotating member supporting the seat frame, a base member rotatably supporting the rotating member, and an electrical component such as an electric motor for rotating the rotating member is known from for example Patent Document 3, etc. 
     In such a vehicle rotating seat device, an electrical component is often mounted on the seat frame side, and there is a fourth problem that when a seat main body and a seat frame rotate, an electric wire connected to the electrical component will slag or be damaged due to an unreasonable load acting thereon, and there is a desire to avoid this. 
     It is a fourth object of the present invention to provide a vehicle seat-rotating device that can solve the fourth problem by avoiding the occurrence of slagging of an electric wire connected to an electrical component or the occurrence of damage to the electric wire when a seat main body is rotating. 
     Means for Solving the Problems 
     Solution Means for First Problem and Effects Thereof 
     In order to attain the first object, according to a first aspect of the present invention, there is provided a rotating device for a vehicle interior item, comprising a base member that has a rotation support part, a rotating member that supports the vehicle interior item, is rotatably supported by the rotation support part, and is disposed above the base member, rotation-locking means that enables the rotating member to be switched between a rotatable state and a non-rotatable state, latching means that is provided on the base member side, and engagement means that is provided on the rotating member side and can be switched between a state in which the engagement means engages with the latching means when the rotating member is in a non-rotating state so as to suppress detachment of the rotating member from the base member and a state in which the engagement with the latching means is released when the rotating member attains the rotatable state, characterized in that the latching means and the engagement means are disposed further outside than the rotating member in plan view at least when the rotating member is in the non-rotating state. In accordance with the first aspect, since the latching means and the engagement means are disposed further outside than the rotating member in plan view at least when the rotating member is not rotating, the latching means and the engagement means do not overlap the rotating member in the height direction, and it is possible to form the rotating device compactly in the height direction while suppressing, by the latching means and the engagement means, detachment of the rotating member. 
     Further, according to a second aspect of the present invention, in addition to the first aspect, the engagement means is disposed at a position where at least part of the engagement means overlaps the rotating member when viewed from a side. In accordance with the second aspect, since at least part of the engagement means overlaps the rotating member when viewed from the side, it is possible to suppress any increase in the height of the rotating device due to disposition of the engagement means. 
     According to a third aspect of the present invention, in addition to the first or second aspect, the latching means is fixed to the base member at a position where at least part of the latching means overlaps the base member supported on a vehicle floor when viewed from the side. In accordance with the third aspect, due to the latching means being fixed to the base member supported on the vehicle floor, the latching means can be attached to the base member in advance when assembling the rotating device onto the vehicle floor, it is possible to enhance the ease of assembly, and it is also possible to suppress any increase in the height of the rotating device due to disposition of the latching means. 
     According to a fourth aspect of the present invention, in addition to any one of the first to third aspects, the engagement means comprises a shaft support member that is fixed directly or indirectly to the rotating member, a shaft member that is supported by the shaft support member, and a hook member that is pivotably and axially supported by the shaft member, the latching means comprises a striker that can engage with the hook member and a striker support member that supports the striker and is fixed directly or indirectly to the base member, and part of the hook member that is engaged with the striker is set outside the shaft support member in plan view. In accordance with the fourth aspect, since the part where the hook member of the engagement means and the striker of the latching means are engaged is set, in plan view, outside the shaft support member fixed directly or indirectly to the rotating member, when a detachment load is acting it is possible for the striker to easily receive the load. 
     According to a fifth aspect of the present invention, in addition to the fourth aspect, the striker is disposed at a position lower than the lower end of the rotating member when viewed from the side. In accordance with the fifth aspect, since the striker is present at a position lower than the lower end of the rotating member when viewed from the side, it is possible to prevent the rotating member from interfering with the striker when it is rotating while suppressing any increase in the height of the rotating device. 
     According to a sixth aspect of the present invention, in addition to the fourth or fifth aspect, the shaft support member comprises a shaft support wall portion to which the shaft member is fixed while being disposed outside the rotating member in plan view, and a pair of extending wall portions that are connectedly provided on the shaft support wall portion at positions sandwiching the shaft member therebetween and extend toward the rotating member side, and the extending wall portions are fixed directly or indirectly to the rotating member. In accordance with the sixth aspect, since the pair of extending wall parts forming part of the shaft support part while sandwiching the shaft member therebetween are fixed directly or indirectly to the rotating member, it is possible to enhance the bracing strength of the shaft support member when a load is acting on the rotating member. 
     According to a seventh aspect of the present invention, in addition to any one of the first to sixth aspects, the rotating device has movement means that can move the base member in a vehicle fore-and-aft direction, and the engagement means is disposed at a position where the engagement means avoids the movement means in plan view. In accordance with the seventh aspect, since the engagement means is disposed at a position in which, in plan view, it avoids the movement means, which enables the vehicle interior item to move in the vehicle fore-and-aft direction, it is possible, by preventing the movement means and the engagement means from overlapping each other in the height direction, to suppress any increase in the height of the rotating device. 
     According to an eighth aspect of the present invention, in addition to the seventh aspect, the engagement means is disposed outside the movement means in plan view. In accordance with the eighth aspect, since the engagement means is present outside the movement means in plan view, the engagement means is disposed closer to the outside of the rotating device, and it is possible to receive a load from the vehicle interior item side via a more outer part of the base member. 
     According to a ninth aspect of the present invention, in addition to the seventh or eighth aspect, the movement means is disposed between the vehicle floor and the base member, and the latching means is disposed further outside than the movement means in plan view. In accordance with the ninth aspect, since the latching means is disposed in plan view outside the movement means, which is disposed between the vehicle floor and the base member, it is possible to receive a load from the vehicle interior item side via a more outer part of the base member while disposing the latching means so as to avoid interference with the movement means. 
     According to a tenth aspect of the present invention, in addition to the fourth aspect, provided between the shaft support member and the hook member is an urging member that pivotingly urges the hook member in a direction in which the hook member engages with the striker In accordance with the tenth aspect, since the hook member is pivotingly urged by the urging member in a direction in which it engages with the striker, it is possible to retain a state in which the hook member and the striker are engaged. 
     According to an eleventh aspect of the present invention, in addition to the any of the first to tenth aspects, the latching means and the engagement means are placed at two locations on each of opposite sides of the base member and the rotating member in a vehicle width direction while being spaced in the vehicle fore-and-aft direction and disposed further rearward than the front end and further forward than the rear end of the rotating member when viewed from the side in the vehicle width direction. In accordance with the eleventh aspect, due to the latching means and the engagement means in the engaged state being disposed at two locations on each of opposite sides of the base member and the rotating member in the vehicle width direction while being spaced in the vehicle fore-and-aft direction, the latching means and the engagement means are disposed further rearward than the front end and further forward than the rear end of the rotating member while enabling the vehicle interior item to be retained in two attitudes that are rotated through 180 degrees, and it is thus possible to compactly dispose the latching means and the engagement means. 
     According to a twelfth aspect of the present invention, in addition to the eleventh aspect, the pair of engagement means spaced in the vehicle fore-and-aft direction are formed so as to have a structure in which pivoting of lower end parts of the hook members of the two engagement means toward the side on which the lower end parts move away from each other in the non-rotatable state enables individual engagement of the two hook members with the striker to be released. In accordance with the twelfth aspect, since the pair of engagement means spaced in the vehicle fore-and-aft direction are formed so as to disengage from the striker by pivoting the lower end parts of the hook members of the engagement means toward the side on which they move away from each other in a state in which the rotating member cannot rotate, it is possible to prevent the hook members from interfering with each other when releasing the engagement with the striker in the non-rotatable state. 
     According to a thirteenth aspect of the present invention, there is provided a rotating device for a vehicle seat in which the vehicle interior item of the rotating device for a vehicle interior item according to any one of the first to twelfth aspects is a vehicle seat having a seat cushion and a seat back disposed above the seat cushion, wherein the engagement means is disposed at a position in which at least an upper part of the engagement means overlaps the seat cushion when viewed from the side. In accordance with the thirteenth aspect, since at least the upper part of the engagement means overlaps the seat cushion of the vehicle seat when viewed from the side, it is possible to suppress any increase in the height of the vehicle seat. 
     According to a fourteenth aspect of the present invention, in addition to the thirteenth aspect, the rotating device for a vehicle seat comprises a reclining lever that operates so as to switch between a state in which tilting of the seat back, which is tiltable with respect to the seat cushion, is enabled and a state in which the tilting is restricted, and at least part of specific engagement means, which is at least one of the plurality of engagement means, is disposed so as to overlap the reclining lever when viewed from the side. In accordance with the fourteenth aspect, since when viewed from the side at least part of the specific engagement means, which is at least one of the plurality of engagement means, overlaps the reclining lever, which operates so as to switch the inclined state of the seat back, it is possible to suppress any increase in the height of the rotating device for a vehicle seat equipped with the reclining lever. 
     According to a fifteenth aspect of the present invention, in addition to the fourteenth aspect, a seat cushion frame supporting the seat cushion is formed from a pair of side frames that are arranged at positions spaced from each other and extend linearly, and a pair of linking frames that provide a link between opposite end parts of the side frames, and the engagement means is disposed at a position where at least part of the engagement means overlaps the side frame when viewed from the side. In accordance with the fifteenth aspect, since at least part of the engagement means overlaps the pair of side frames forming part of the seat cushion frame when viewed from the side, it is possible to suppress any increase in the height of the rotating device for a vehicle seat. 
     Moreover, according to a sixteenth aspect of the present invention, in addition to the fourteenth aspect, the reclining lever is disposed outside one side frame of the pair of side frames in plan view, and at least part of the specific engagement means is disposed further outside than the reclining lever in plan view. In accordance with the sixteenth aspect, since at least part of the specific engagement means is present in plan view outside the reclining lever disposed outside one side frame among the pair of side frames, it is possible to receive a load from the vehicle interior item side via a more outer part of the base member. 
     &lt;Solution Means for Second Problem and Effects Thereof 
     In order to achieve the second object, according to a first aspect of the present invention, there is provided a vehicle seat device that includes a rotation mechanism ( 117 ) that has a rotating member ( 130 ) having mounted thereon a seat cushion frame ( 119 ) supporting a seat cushion ( 112 ,  172 ) and a base member ( 129 ) rotatably supporting the rotating member ( 130 ) from below, characterized in that at least part, along a peripheral direction, of an outer periphery of an upper part of the rotating member ( 130 ) is covered by a cover ( 165 ,  175 ,  178 ) from the outside. In accordance with the first aspect, since at least part along the peripheral direction of the outer periphery of the upper part of the rotating member is covered by the cover from the outside, it is possible to prevent foreign matter from entering the interior via at least the part of the rotation mechanism that is covered by the cover. 
     Furthermore, according to a second aspect of the present invention, in addition to the first aspect, the cover ( 165 ,  175 ,  178 ) is disposed at a position in which the cover ( 165 ,  175 ,  178 ) covers the outer periphery of the upper part of the rotating member ( 130 ) from a rear in a state in which an occupant seated on the seat cushion ( 112 ,  172 ) faces forward in a vehicle fore-and-aft direction. In accordance with the second aspect, since the cover covers the outer periphery of the upper part of the rotating member from the rear in a state in which an occupant seated on the seat cushion faces forward in the vehicle fore-and-aft direction, it is possible to suppress the entry of foreign matter into the rotation mechanism from a rear passenger seat side in a state in which a driver&#39;s seat or a passenger seat faces forward. 
     Moreover, according to a third aspect of the present invention, in addition to the second aspect, the cover ( 175 ) is formed by extending a skin ( 172   a ) of the seat cushion ( 172 ). In accordance with the third aspect, since the cover is formed from the skin of the seat cushion, when suppressing the entry of foreign matter into the rotation mechanism, it is possible to avoid any increase in the number of components. 
     Furthermore, according to a fourth aspect of the present invention, in addition to the first or second aspect, in a state in which an occupant seated on the seat cushion ( 112 ) faces forward in the vehicle fore-and-aft direction, a skin ( 112   a ) of the seat cushion ( 112 ) is linked to a rear edge of an upper end part of the rotating member ( 130 ) while being in contact with an outer face of the cover ( 165 ,  178 ). In accordance with the fourth aspect, since the skin of the seat cushion is linked to the rear edge of the upper end part of the rotating member in a state in which an occupant seated on the seat cushion faces forward in the vehicle fore-and-aft direction and, moreover, the skin is in contact with the outer face of the cover, it is possible to link the upper part of the cover directly to the skin of the seat cushion and to suppress more effectively the entry of foreign matter into the rotation mechanism from the rear passenger seat side in a state in which the driver&#39;s seat or the passenger seat faces forward. 
     Moreover, according to a fifth aspect of the present invention, in addition to the first, second or fourth aspect, the seat cushion frame ( 119 ) has a pair of side frames ( 119   a ) that extend linearly and are supported on the rotating member ( 130 ), and the cover ( 165 ) is mounted on the side frames ( 119   a ). In accordance with the fifth aspect, since the cover is mounted on the pair of side frames of the seat cushion frame, it is possible to rotate the cover together with the seat by a simple structure. 
     Furthermore, according to a sixth aspect of the present invention, in addition to the first, second, fourth or fifth aspect, an outside face of the cover ( 165 ,  178 ) is formed into an arc shape that protrudes toward the outside of the rotating member ( 130 ). In accordance with the sixth aspect, since the outside face of the cover has an arc shape that protrudes toward the outside of the rotating member, when the cover rotates together with the seat, even if the cover comes into contact with luggage, etc. on a floor within a vehicle compartment, it is possible to realize smooth rotation of the cover, and consequently the seat. 
     Moreover, according to a seventh aspect of the present invention, in addition to the first to sixth aspects, in a state in which an occupant seated on the seat cushion ( 112 ,  172 ) faces forward in the vehicle fore-and-aft direction, a fixed cover member ( 167 ,  177 ) that covers at least the base member ( 129 ) from the rear is fixedly disposed beneath the cover ( 165 ,  175 ,  178 ). In accordance with the seventh aspect, since the fixed cover member, which covers at least the base member from the rear in a state in which an occupant seated on the seat cushion faces forward in the vehicle fore-and-aft direction, is fixedly disposed beneath the cover, it is possible to suppress the entry of foreign matter into the rotation mechanism from the rear passenger seat side in a state in which a driver&#39;s seat or a passenger seat faces forward. 
     Furthermore, according to an eighth aspect of the present invention, in addition to the seventh aspect, the fixed cover member ( 167 ) is formed so as to be in relatively slidable contact with a lower part of the cover ( 165 ,  178 ) in a state in which an occupant seated on the seat cushion ( 112 ) faces forward in the vehicle fore-and-aft direction. In accordance with the eighth aspect, since the fixed cover member is in relatively slidable contact with the lower part of the cover, it is possible to suppress more effectively the entry of foreign matter into the rotation mechanism from the rear passenger seat side in a state in which a driver&#39;s seat or a passenger seat faces forward. 
     Moreover, according to a ninth aspect of the present invention, in addition to the seventh or eighth aspect, the lower end position of a side cover ( 114 ) covering the side frame ( 119   a ) from the outside is set at the same height as the lower end position of the cover ( 165 ,  178 ). In accordance with the ninth aspect, due to the lower end position of the side cover being the same as the lower end position of the cover, it is possible to suppress the entry of foreign matter into the rotation mechanism from the rear passenger seat side in a state in which a driver&#39;s seat or a passenger seat faces in the vehicle width direction. 
     Furthermore, according to a tenth aspect of the present invention, in addition to the ninth aspect, the cover ( 178 ) is formed integrally with at least one of the pair of side covers ( 114 ). In accordance with the tenth aspect, since the cover is formed integrally with at least one of the pair of side covers, it is possible to easily assemble the cover while avoiding any increase in the number of components due to disposition of the cover. 
     &lt;Solution Means for Third Problem and Effects Thereof 
     In order to achieve the third object, according to a first aspect of the present invention, there is provided a vehicle seat device that includes a seat cushion frame ( 216 ) that supports a seat cushion ( 211   a ), a rotation mechanism ( 214 ) that is disposed beneath the seat cushion frame ( 216 ) while having a rotating member ( 230 ) supporting the seat cushion frame ( 216 ) and having a base member ( 229 ) rotatably supporting the rotating member ( 230 ) from beneath, electrical equipment ( 253 ,  265 ), and an ECU ( 270 ,  271 ) that controls operation of the electrical equipment ( 253 ,  265 ), characterized in that a circular housing part ( 241 ) opening at least upward is formed in a central part of the rotating member ( 230 ), and the ECU ( 270 ,  271 ) is present within the housing part ( 241 ) in plan view and is disposed at a position in which at least part of the ECU ( 270 ,  271 ) overlaps the rotating member ( 230 ) when viewed from the side. In accordance with the first aspect, since the ECU is housed in plan view within the circular housing part, which is formed in the central part of the rotating member and opens at least upward, and at least part of the ECU is present at a position in which it overlaps the rotating member when viewed from the side, it is possible, by suppressing upward protrusion of the ECU from the rotating member, to avoid any increase in the height of the seat cushion caused by disposition of the ECU and it is also possible to avoid any increase in the size of the vehicle seat device in a direction orthogonal to the rotational axis of the rotating member. 
     Furthermore, according to a second aspect of the present invention, in addition to the first aspect, the rotating member ( 230 ) is formed so as to have a taper portion ( 230   a ) whose diameter increases in going upward, a cylindrical side wall portion ( 230   b ) that rises upward from an upper end part of the taper portion ( 230   a ) so as to form the housing part ( 241 ) in cooperation with the taper portion ( 230   a ), and a collar portion ( 230   c ) that protrudes outward from the side wall portion ( 230   b ), and the ECU ( 270 ,  271 ) is disposed in an attitude in which it is inclined along the taper portion ( 230   a ). In accordance with the second aspect, due to the ECU being disposed in an attitude in which it is inclined along the taper portion of the rotating member, it is possible to suppress more effectively upward protrusion of the ECU from the rotating member and suppress more effectively the height of the seat cushion. 
     Moreover, according to a third aspect of the present invention, in addition to the second aspect, the rotating member ( 230 ) has mounted thereon a mounting member ( 258 ) that in plan view is disposed further inside than an outer periphery ( 230   d ) of the rotating member ( 230 ), and the ECU ( 270 ,  271 ) is mounted on the mounting member ( 258 ). In accordance with the third aspect, since the ECU is mounted on the mounting member disposed further inside than the outer periphery of the rotating member in plan view and mounted on the rotating member, it is possible to avoid any increase in the size of the vehicle seat device in a direction orthogonal to the rotational axis of the rotating member due to disposition of the mounting member for mounting the ECU. 
     Furthermore, according to a fourth aspect of the present invention, in addition to the third aspect, the mounting member ( 258 ) has an inclined plate portion ( 258   b ) that is inclined along the taper portion ( 230   a ) and is disposed within the housing part ( 241 ), and the ECU ( 270 ,  271 ) is mounted on the inclined plate portion ( 258   b ). In accordance with the fourth aspect, since the ECU is mounted on the inclined plate portion possessed by the mounting member and disposed within the housing part, it is possible to easily mount the ECU on the mounting member in an inclined attitude along the taper portion of the rotating member, thus suppressing upward protrusion of the ECU from the rotating member. 
     Moreover, according to a fifth aspect of the present invention, in addition to the fourth aspect, the mounting member ( 258 ) is joined to the collar portion ( 230   c ) of the rotating member ( 230 ) further forward than a rotational axis ( 2 C) of the rotating member ( 230 ), and the ECU ( 270 ,  271 ) is mounted on the inclined plate portion ( 258   b ) at a position in which it avoids interference with a cushion-side pressure-receiving member ( 219 ) mounted on the seat cushion frame ( 216 ) so as to receive a load from above the seat cushion ( 211   a ). In accordance with the fifth aspect, since the mounting member is joined to the collar portion of the rotating member further forward than the rotational axis of the rotating member, and the ECU is mounted on the inclined plate portion at a position in which it avoids interference with the cushion-side pressure-receiving member mounted on the seat cushion frame so as to receive a load from above the seat cushion, it is possible to avoid any increase in the vertical dimension of the vehicle seat device. 
     Furthermore, according to a sixth aspect of the present invention, in addition to the fifth aspect, the ECU ( 270 ,  271 ) is disposed while avoiding a position immediately below a lowest end ( 219   a ) of the cushion-side pressure-receiving member ( 219 ) when viewed from the side. In accordance with the sixth aspect, since the ECU is not disposed immediately below the lowest end of the cushion-side pressure-receiving member when viewed from the side, it is possible to more easily avoid interference between the ECU and the cushion-side pressure-receiving member. 
     Moreover, according to a seventh aspect of the present invention, in addition to the first or second aspect, the ECU ( 270 ,  271 ) and an electric motor ( 253 ) that exerts power for rotating the rotating member ( 230 ) are mounted on the side of one of the base member ( 229 ) and the rotating member ( 230 ). In accordance with the seventh aspect, since the electric motor and the ECU are mounted on the side of one of the base member and the rotating member, it is possible to easily provide a connection between the electric motor and the ECU. 
     Furthermore, according to an eighth aspect of the present invention, in addition to the seventh aspect, the electric motor ( 253 ) and the ECU ( 270 ,  271 ) are mounted on the side of the one of the base member ( 229 ) and the rotating member ( 230 ) that has the larger vertical dimension. In accordance with the eighth aspect, since the electric motor and the ECU are mounted on the side of the one of the base member and the rotating member that has the larger vertical dimension, it is possible to easily ensure there is space for disposing the electric motor and the ECU while suppressing any increase in the height of the vehicle seat device. 
     Moreover, according to a ninth aspect of the present invention, in addition to the seventh or eighth aspect, the electric motor ( 253 ) and the ECU ( 270 ,  271 ) are mounted on a mounting member ( 258 ) that is disposed further inside than the outer periphery ( 230   d ) of the rotating member ( 230 ) in plan view and mounted on one of the base member ( 229 ) and the rotating member ( 230 ). In accordance with the ninth aspect, since the electric motor and the ECU are mounted on the mounting member, which is disposed further inside than the outer periphery of the rotating member in plan view, it is possible to avoid any increase in the dimension of the vehicle seat device in a direction orthogonal to the rotational axis of the rotating member due to disposition of the mounting member for mounting the ECU and the electric motor. 
     Furthermore, according to a tenth aspect of the present invention, in addition to the ninth aspect, the mounting member ( 258 ) is mounted on the rotating member ( 230 ). In accordance with the tenth aspect, since the mounting member is mounted on the rotating member, when the rotating member is rotating, the electric motor and the ECU also rotate with respect to the base member, and it is possible to compactly collect together connecting wires between the electric motor and the ECU for controlling operation of the electric motor. 
     It should be noted here that a second taper portion  230   a  of an embodiment of the solution means for the third problem, which is described later, corresponds to the taper portion of the present invention, a fourth side wall portion  230   b  similarly corresponds to the side wall portion of the present invention, a second collar portion  230   c  similarly corresponds to the collar portion of the present invention, and an electric motor  253  and a blower  265  similarly correspond to electrical equipment of the present invention. 
     Solution Means for Fourth Problem and Effects Thereof 
     In order to achieve the fourth object, according to a first aspect of the present invention, there is provided a vehicle rotating seat device that includes a seat frame ( 315 ) that supports a seat main body ( 311 ), a rotating member ( 330 ) that supports the seat frame ( 315 ), a base member ( 329 ) that rotatably supports the rotating member ( 330 ) from below, and an electrical component ( 350 ,  365 ,  374 ,  378 ) that is mounted on at least one of the seat frame ( 315 ) and the rotating member ( 330 ), characterized in that an electric wire ( 359 ,  369 ,  376 ,  380 ) connected to the electrical component ( 350 ,  365 ,  374 ,  378 ) is retained by an electric wire retaining member ( 360 ,  384 ,  386 ) that is fixedly disposed at a center of rotation ( 3 C) of the rotating member ( 330 ). In accordance with the first aspect, since the electric wire connected to the electrical component mounted on at least one of the seat frame and the rotating member is retained by the electric wire retaining member positioned at the center of rotation of the rotating member, it is possible to avoid the occurrence of sagging or damage to the electric wire connected to the electrical component when the seat main body is rotating. 
     Furthermore, according to a second aspect of the present invention, in addition to the first aspect, a plurality of the electric wires ( 359 ,  369 ,  376 ,  380 ) individually connected to a plurality of the electrical components ( 350 ,  365 ,  374 ,  378 ) are retained collectively by the single electric wire retaining member ( 360 ,  384 ,  386 ). In accordance with the second aspect, since the plurality of electric wires individually connected to the plurality of electrical components are retained collectively by the single electric wire retaining member, it is possible to compactly collect together the plurality of electric wires and carry out wiring. 
     Moreover, according to a third aspect of the present invention, in addition to the first or second aspect, a cushion-side pressure-receiving member ( 319 ) that receives a load from above a seat cushion ( 311   a ) forming part of the seat main body ( 311 ) is mounted on a seat cushion frame ( 316 ) that forms part of the seat frame ( 315 ) and is supported on the rotating member ( 330 ), and the electric wire retaining member ( 360 ,  384 ,  386 ) is disposed at a position in which the electric wire ( 359 ,  369 ,  376 ,  380 ) is retained beneath the cushion-side pressure-receiving member ( 319 ). In accordance with the third aspect, since the electric wire retaining member is disposed at a position in which the electric wire is retained beneath the cushion-side pressure-receiving member mounted on the seat cushion frame forming part of the seat frame, it is possible to suppress protrusion of the electric wire retaining member toward the occupant seating face side, thus enabling interference of the electric wire retaining member with an occupant seated on the seating face to be avoided. 
     Furthermore, according to a fourth aspect of the present invention, in addition to the third aspect, the electric wire retaining member ( 360 ) is mounted directly on the cushion-side pressure-receiving member ( 319 ). In accordance with the fourth aspect, since the electric wire retaining member is mounted directly on the cushion-side pressure-receiving member while retaining the electric wire beneath the cushion-side pressure-receiving member, it is possible to avoid interference of the electric wire retaining member with an occupant seated on the seating face and also to efficiently dispose the electric wire retaining member at the center of rotation of the rotating member while avoiding any increase in the number of components due to there being no need for newly providing a member for mounting the electric wire retaining member. 
     Moreover, according to a fifth aspect of the present invention, in addition to the first or second aspect, the cushion-side pressure-receiving member ( 319 ), which receives a load from above the seat cushion ( 311   a ) forming part of the seat main body ( 311 ), is mounted on the cushion frame ( 316 ), which forms part of the seat frame ( 315 ) and is supported on the rotating member ( 330 ), and the electric wire retaining member ( 360 ) is mounted directly on the cushion-side pressure-receiving member ( 319 ). In accordance with the fifth aspect, since the electric wire retaining member is mounted directly on the cushion-side pressure-receiving member, it is possible to efficiently dispose the electric wire retaining member at the center of rotation of the rotating member while avoiding any increase in the number of components due to there being no need for newly providing a member for mounting the electric wire retaining member. 
     Furthermore, according to a sixth aspect of the present invention, in addition to the third to fifth aspects, the seat frame ( 315 ) comprises the seat cushion frame ( 316 ), which is supported on the rotating member ( 330 ), and a seat back frame ( 317 ) that is tiltably mounted on the seat cushion frame ( 316 ) or the rotating member ( 330 ) via a support shaft ( 312 ), an electric actuator for tilting ( 378 ), which is the electrical component, is mounted on a lower part of the seat back frame ( 317 ) so that the seat back frame ( 317 ) can be driven so as to tilt, and the electric wire ( 380 ) connected to the electric actuator for tilting ( 378 ) is retained by the electric wire retaining member ( 360 ) via an intermediate retaining member ( 381 ) mounted on the seat back frame ( 317 ) or the rotating member ( 330 ) in the vicinity of the support shaft ( 312 ). In accordance with the sixth aspect, since the electric actuator for tilting, which is for driving and tilting the seat back frame tiltably mounted on the seat cushion frame or the rotating member via the support shaft, is mounted on the lower part of the seat back frame, and the electric wire connected to the electric actuator for tilting is retained by the electric wire retaining member via the intermediate retaining member mounted on the seat cushion frame or the rotating member in the vicinity of the support shaft, it is possible to prevent the electric wire between the electric wire retaining member and the electric actuator for tilting from sagging or being damaged when the seat main body is rotating or the seat back frame is being tilted. 
     Moreover, according to a seventh aspect of the present invention, in addition to the third aspect, a retaining member-supporting member ( 383 ,  385 ) is mounted on the base member ( 329 ), and the electric wire retaining member ( 384 ,  386 ) is mounted on the retaining member-supporting member ( 383 ,  385 ). In accordance with the seventh aspect, since the electric wire retaining member is mounted on the retaining member-supporting member, which is mounted on the base member, it is possible to easily assemble the electric wire retaining member when assembling the seat-rotating device, thus improving the workability. 
     Furthermore, according to an eighth aspect of the present invention, in addition to the seventh aspect, the electric wire retaining member ( 384 ) retains the electric wires ( 359 ,  369 ,  376 ,  380 ) above the retaining member-supporting member ( 383 ) and is mounted on the retaining member-supporting member ( 383 ). In accordance with the eighth aspect, since the electric wire retaining member retains the electric wire above the retaining member-supporting member, it is possible to carry out wiring by compactly collecting together the electric wires within the seat-rotating device. 
     Moreover, according to a ninth aspect of the present invention, in addition to the seventh aspect, the electric wire retaining member ( 386 ) retains the electric wires ( 359 ,  369 ,  376 ,  380 ) beneath the retaining member-supporting member ( 385 ) and is mounted on the retaining member-supporting member ( 385 ). In accordance with the ninth aspect, since the electric wire retaining member retains the electric wire beneath the retaining member-supporting member, it is possible to carry out operations in a state in which the seat-rotating device is laid sideways when assembling the seat-rotating device, thus enabling the electric wire to be easily retained by the electric wire retaining member and thereby improving the workability. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       Explanation of Drawings Showing Embodiments of Solution Means for First Problem 
         FIG. 1  is a perspective view of a rotating device for a vehicle seat. 
         FIG. 2  is a side view of the rotating device for a vehicle seat in which the vehicle seat is omitted. 
         FIG. 3  is a view in the direction of arrow  3  in  FIG. 2  in a state in which a seat cushion is omitted. 
         FIG. 4  is a view in the direction of arrow  4  in  FIG. 3 . 
         FIG. 5  is a sectional view along line  5 - 5  in  FIG. 3 . 
         FIG. 6  is a sectional view showing the arrangement of a rotation locking mechanism separately in a locked state (a) and a lock release state (b). 
         FIG. 7  is a sectional view along line  7 - 7  in  FIG. 6 ( a ) . 
         FIG. 8  is a perspective view showing an essential part of a vehicle seat device. 
         FIG. 9  is an enlarged view of a part shown by arrow  9  in  FIG. 4 . 
         FIG. 10  is an enlarged view of a part shown by arrow  10  in  FIG. 2 . 
         FIG. 11  is an enlarged view of a part shown by arrow  11  in  FIG. 3 . 
     
    
    
     Explanation of Drawings Showing Embodiments of Solution Means for Second Problem 
       FIG. 12  is a perspective view of a vehicle seat device of a first embodiment. 
       FIG. 13  is a perspective view when viewed from the direction shown by arrow  13  in  FIG. 12 . 
       FIG. 14  is a perspective view in state in which a seat cushion, a seat back, and a side cover are removed from  FIG. 12 . 
       FIG. 15  is a sectional view along line  15 - 15  in  FIG. 16  showing part of a slide rail and a rotation mechanism. 
       FIG. 16  is a view when the slide rail and the rotation mechanism are viewed from the direction shown by arrow  16  in  FIG. 15 . 
       FIG. 17  is a sectional view along line  17 - 17  in  FIG. 16 . 
       FIG. 18  is a sectional view along line  18 - 18  in  FIG. 17 . 
       FIG. 19  is a sectional view along line  19 - 19  in  FIG. 16  showing part of the vehicle seat device. 
       FIG. 20  is a sectional view, corresponding to  FIG. 19 , of a second embodiment. 
       FIG. 21  is a perspective view, corresponding to  FIG. 13 , of a third embodiment. 
     Explanation of Drawings Showing Embodiments of Solution Means for Third Problem 
       FIG. 22  is a perspective view showing a vehicle seat device in a state in which a seat main body is omitted. 
       FIG. 23  is a plan view when an essential part of the vehicle seat device is viewed from above. 
       FIG. 24  is a sectional view along line  24 - 24  in  FIG. 23 . 
       FIG. 25  is a view of a slide rail and a rotation mechanism from the same direction as in  FIG. 23 . 
       FIG. 26  is a view when the slide rail and the rotation mechanism are viewed from the side opposite to that in  FIG. 25 . 
       FIG. 27  is a sectional view along line  27 - 27  in  FIG. 25 . 
     Explanation of Drawings Showing Embodiments of Solution Means for Fourth Problem 
       FIG. 28  is a perspective view showing a vehicle seat-rotating device of a first embodiment in a state in which a seat main body is omitted. 
       FIG. 29  is a plan view when an essential part of the vehicle seat-rotating device is viewed from above. 
       FIG. 30  is a sectional view of the seat-rotating device along line  30 - 30  in  FIG. 29 . 
       FIG. 31  is a view in the direction of arrow  31  in  FIG. 30  in a state in which a seat cushion frame and a cushion-side pressure-receiving member are omitted. 
       FIG. 32  is a sectional view of the seat-rotating device along line  32 - 32  in  FIG. 31 . 
       FIG. 33  is a sectional view, corresponding to  FIG. 30 , of a second embodiment. 
       FIG. 34  is a view in the direction of arrow  34  in  FIG. 33  in a state in which a seat cushion frame and a cushion-side pressure-receiving member are omitted. 
       FIG. 35  is a sectional view, corresponding to  FIG. 30 , of a third embodiment. 
     EXPLANATION OF REFERENCE NUMERALS AND SYMBOLS 
     Explanation of Reference Numerals and Symbols of Drawings Showing Embodiment of Solution Means for First Problem 
     
         
           11  Vehicle seat, which is a vehicle interior item 
           12  Seat cushion 
           13  Seat back 
           15  Seat cushion frame 
           17  Reclining lever 
           18  Side frame 
           19  Pan frame, which is a linking frame 
           20  Rear pipe, which is a linking frame 
           22  Base member 
           23  Rotating member 
           30  Rotation support part 
           35  Vehicle floor 
           36  Movement means 
           45  Rotation-locking means 
           62  Latching means 
           63  Engagement means 
           66  Shaft support member 
           66   a  Shaft support wall portion 
           66   b  Extending wall portion 
           67  Shaft member 
           69  Hook member 
           70  Striker 
           71  Striker support member 
           74  Second coil spring, which is an urging member 
       
    
     Explanation of Reference Numerals and Symbols of Drawings Showing Embodiments of Solution Means for Second Problem 
     
         
           110  Vehicle seat device 
           112  Seat cushion 
           112   a  Skin 
           114  Side cover 
           117  Rotation mechanism 
           119  Seat cushion frame 
           119   a  Side frame 
           129  Base member 
           130  Rotating member 
           165 ,  175 ,  178  Cover 
           167 ,  177  Fixed cover member 
       
    
     Explanation of Reference Numerals and Symbols of Drawings Showing Embodiment of Solution Means for Third Problem 
     
         
           211   a  Seat cushion 
           214  Rotation mechanism 
           216  Seat cushion frame 
           219  Cushion-side pressure-receiving member 
           219   a  Lowest end of cushion-side pressure-receiving member 
           229  Base member 
           230  Rotating member 
           230   a  Taper portion 
           230   b  Side wall portion 
           230   c  Collar portion 
           230   d  Outer periphery of rotating member 
           241  Housing part 
           253  Electric motor, which is electrical equipment 
           258  Mounting member 
           258   b  Inclined plate portion 
           265  Blower, which is electrical equipment 
           270 ,  271  ECU 
           2 C Rotational axis 
       
    
     Explanation of Reference Numerals and Symbols of Drawings Showing Embodiments of Solution Means for Fourth Problem 
     
         
           311  Seat main body 
           311   a  Seat cushion 
           312  Support shaft 
           315  Seat frame 
           316  Seat cushion frame 
           317  Seat back frame 
           319  Cushion-side pressure-receiving member 
           329  Base member 
           330  Rotating member 
           350  Electric actuator for rotation, which is an electrical component 
           359 ,  369 ,  376 ,  380  Electric wire 
           360 ,  384 ,  386  Electric wire retaining member 
           365  Blower, which is an electrical component 
           374  Electric actuator for raising/lowering, which is an electrical component 
           378  Electric actuator for tilting, which is an electrical component 
           381  Intermediate retaining member 
           383 ,  385  Retaining member-supporting member 
           3 C Center of rotation 
       
    
     MODES FOR CARRYING OUT THE INVENTION 
     Embodiment of Solution Means for First Problem 
     An embodiment of the present invention is explained below by reference to the attached drawings. In the explanation below, ‘fore and aft’, ‘left and right’ and ‘up and down’ refer to directions viewed by an occupant when a vehicle seat is in an attitude in which the occupant seated thereon faces forward. 
     First, in  FIG. 1 , a vehicle seat  11 , which is a vehicle interior item, includes a seat cushion  12  for an occupant to be seated on, a seat back  13  supporting the back of the occupant seated on the seat cushion  12 , and a headrest  14  provided on an upper part of the seat back  13  so that the up-and-down position of the headrest  14  can be adjusted. 
     Referring in addition to  FIG. 2  to  FIG. 4 , the seat cushion  12  is supported by a seat cushion frame  15 , and the seat back  13  is supported by a seat back frame (not illustrated) that is tiltably linked, via a reclining mechanism (not illustrated), to a rear part of the seat cushion frame  15  when the vehicle seat  11  is in a state in which the vehicle seat  11  faces a reference direction, that is, in a state in which an occupant seated on the seat cushion  12  faces forward in the vehicle fore-and-aft direction. 
     The seat cushion frame  15  is formed from a pair of side frames  18  that are arranged at positions spaced from each other and extend linearly in the vehicle fore-and-aft direction, and a pair of linking frames that provide a link between opposite end parts of the side frames  18 ; in this embodiment one of the pair of linking frames is a pan frame  19  that provides a link between front end parts of the pair of side frames  18  in a state in which the vehicle seat  11  faces the reference direction, and the other linking frame is a rear pipe  20  that provides a link between rear end parts of the side frames  18 . 
     A reclining lever  17  for operating the reclining mechanism is disposed, among the pair of side frames  18 , outside one side frame  18  in plan view, in this embodiment on the outside in plan view of the side frame  18  disposed on the left side in a state in which the vehicle seat  11  faces the reference direction. 
     Referring in addition to  FIG. 5 , the seat cushion frame  15  is provided on a rotation mechanism  21 , the rotation mechanism  21  including a base member  22 , an annular rotating member  23  that supports the seat cushion frame  15  and is rotatably supported by the base member  22 , and a cover member  24  that covers part of the rotating member  23  from above and is fixed to the base member  22 . 
     The base member  22  has an annular first bottom wall portion  22   a , a cylindrical first side wall portion  22   b  that rises upward from an outer peripheral part of the first bottom wall portion  22   a , and a first collar portion  22   c  that protrudes outward from an upper end part of the first side wall portion  22   b , the first collar portion  22   c  being formed into a rectangular shape. 
     The cover member  24  has an annular second bottom wall portion  24   a  that abuts against the first bottom wall portion  22   a  of the base member  22  from above, a cylindrical second side wall portion  24   b  that rises slightly upward from the outer periphery of the second bottom wall portion  24   a , a first taper portion  24   c  that is formed so as to have a larger diameter in going upward and is connectedly provided on an upper end part of the second side wall portion  24   b , an annular first flat wall portion  24   d  that is connected to an upper end part of the first taper portion  24   c , and a cylindrical third side wall portion  24   e  that rises upward from the outer periphery of the first flat wall portion  24   d , the second bottom wall portion  24   a  being joined to the first bottom wall portion  22   a  of the base member  22  by a plurality of rivets  25 . 
     The rotating member  23  has a second taper portion  23   a  that is disposed at a position opposing the first taper portion  24   c  of the cover member  24  from the outside and is formed so as to have a larger diameter in going upward, a cylindrical fourth side wall portion  23   b  that rises upward from an upper end part of the second taper portion  23   a  so as to oppose the third side wall portion  24   e  of the cover member  24  from the outside, and a second collar portion  23   c  that protrudes outward from the fourth side wall portion  23   b , the second collar portion  23   c  being formed into a rectangular shape. A frame support plate  26  is fastened to opposite sides of the second collar portion  23   c  in the vehicle width direction by means of pluralities of first bolts  27  and first nuts  28 , and the side frame  18  of the seat cushion frame  15  is mounted on the frame support plate  26 . 
     The rotating member  23  is rotatably supported on an annular rotation support part  30  of the base member  22  via a bearing  31 , and the rotation support part  30  is formed into an annular shape from the first bottom wall portion  22   a  and the first side wall portion  22   b  of the base member  22  so that its cross-sectional shape is substantially L-shaped. 
     The bearing  31  is formed by retaining balls  33  at a plurality of locations in the peripheral direction of an annular retainer  32 , and an annular recess part  34  for the balls  33  to roll in is formed in the second taper portion  23   a  of the rotating member  23 . 
     The base member  22  can be made to move in the vehicle fore-and-aft direction by movement means  36 , the movement means  36  being disposed between a vehicle floor  35  and the base member  22 . 
     The movement means  36  includes a pair of left and right fixed rails  37  that extend in the vehicle fore-and-aft direction while being spaced in the left-and-right direction, and a pair of left and right movable rails  38  that are slidably fitted to the fixed rails  37 ; the fixed rails  37  are fixed to the vehicle floor  35  via a front rail support member  39  and rear rail support member  40  that are disposed so as to be spaced in the vehicle fore-and-aft direction, and due to the front rail support member  39  being formed so as to be higher than the rear rail support member  40  the fixed rails  37  are supported on the vehicle floor  35  in an attitude in which they are inclined downward to the rear. 
     As is clearly shown in  FIG. 5 , the movable rail  38  has secured thereto by welding, etc. support brackets  42 , and these support brackets  42  are fastened to opposite sides in the vehicle width direction of the first collar portion  22   c  of the base member  22  by means of pluralities of second bolts  43  and second nuts  44 . That is, the base member  22  is supported on the vehicle floor  35  via the support bracket  42  and the movement means  36 . 
     Referring in addition to  FIG. 6  and  FIG. 7 , a rotatable state and a non-rotatable state of the rotating member  23  can be switched between by rotation-locking means  45 , the rotation-locking means  45  including a lock member  46  supported on the rotating member  23 , an annular push-out member  47  disposed between the third side wall portion  24   e  of the cover member  24  and the fourth side wall portion  23   b  of the rotating member  23  and operating in association with operation of the lock member  46 , and a rattle-suppressing member  48  disposed at a plurality of locations spaced in the peripheral direction of the push-out member  47 . 
     Provided at a plurality of locations, spaced in the peripheral direction, of the push-out member  47  are housing holes  49  extending lengthwise in the peripheral direction of the push-out member  47 . The rattle-suppressing member  48  is housed in the housing hole  49 . 
     On the other hand, the lock member  46  having part thereof protruding outward from the pan frame  19  is pivotably supported on the second collar portion  23   c  of the rotating member  23  via a shaft  59 . The lock member  46  can pivot between a locked position in which as shown in  FIG. 6 ( a )  it engages with the third side wall portion  24   e  of the cover member  24  so as to disable rotation of the rotating member  23 , and a lock release position in which as shown in  FIG. 6 ( b )  the engagement with the third side wall portion  24   e  is released and rotation of the rotating member  23  is enabled. Moreover, as is clearly shown in  FIG. 3  the lock member  46  is pivotingly urged toward the locked position side by means of a spring  51  provided between the lock member  46  and a first spring support member  50  fixed to the second collar portion  23   c , and in this embodiment the spring  51  is a coil spring and two springs  51  are provided so as to stretch between the lock member  46  and the first spring support member  50 . 
     A link arm portion  46   a  of the lock member  46  is inserted through a through hole  52  formed in the fourth side wall portion  23   b  of the rotating member  23 , and an extremity part of the link arm portion  46   a  can be inserted into a link hole  53  formed in the push-out member  47 ; inserting the extremity part of the link arm portion  46   a  into the link hole  53  links the lock member  46  to the push-out member  47 . The link arm portion  46   a  is linked to the link hole  53  when the lock member  46  attains the lock release position as shown in  FIG. 6 ( b ) , and the link arm portion  46   a  applies a pushing force to the push-out member  47  in the pivoting direction. 
     An engagement arm portion  46   b  of the lock member  46  engages with a first through hole  54  formed in the fourth side wall portion  23   b  of the rotating member  23  and a second through hole  55  formed in the third side wall portion  24   e  of the cover member  24  when the lock member  46  is at the locked position shown in  FIG. 6 ( a ) , but disengages from the second through hole  55  to thus release engagement with the cover member  24  when it is at the lock release position shown in  FIG. 6 ( b ) . The engagement arm portion  46   b  operates between the locked position and the lock release position so as to straddle the push-out member  47 . 
     Formed in the fourth side wall portion  23   b  of the rotating member  23  is a recess part  56  that houses part of the rattle-suppressing member  48  and enables the rattle-suppressing member  48  to be closely fitted thereinto. 
     The rattle-suppressing member  48  is formed into a wedge shape so as to have an inclined face  48   a  whose height gradually decreases as the push-out member  47  moves in a direction of movement  57  in response to the lock member  46  operating from the lock release position toward the locked position side, and the recess part  56 , which enables the rattle-suppressing member  48  to be closely fitted therein, is formed into a triangular shape so as to house part of the rattle-suppressing member  48  while having a recess part-side inclined face  56   a  opposing the inclined face  48   a.    
     A first coil spring  58  is provided in a compressed state between the rattle-suppressing member  48  and, among longitudinally opposite end parts of the housing hole  49  formed in the push-out member  47 , a front end part along the direction of movement. The rattle-suppressing member  48  is urged in a direction opposite to the direction of movement  57  by a spring force exerted by the first coil spring  58 . 
     When the lock member  46  is at the locked position, as shown in  FIG. 6 ( a )  the inclined face  48   a  of the rattle-suppressing member  48  abuts closely against the recess part-side inclined face  56   a  of the recess part  56  to thus put the rattle-suppressing member  48  in close contact with the rotating member  23  and the cover member  24 , thereby preventing the rotating member  23  from rattling. 
     When the lock member  46  attains the lock release position, as shown in  FIG. 6 ( b ) , among the longitudinally opposite end parts of the housing hole  49 , a rear end part along the direction of movement  57  abuts against the rattle-suppressing member  48 , the rattle-suppressing member  48  is pushed in the direction of movement against the urging force of the first coil spring  58 , and the rattle-suppressing member  48  moves toward the side on which the inclined face  48   a  of the rattle-suppressing member  48  moves away from the recess part-side inclined face  56   a , thus releasing the state in which rattling is prevented. 
     Referring in addition to  FIG. 8 , detachment of the rotating member  23  from the base member  22  due to a load acting on the rotating member  23  in a non-rotatable state is suppressed by a detachment suppression mechanism  61 . The detachment suppression mechanism  61  includes latching means  62  provided on the base member  22  side and engagement means  63  provided on the rotating member  23  side, the engagement means  63  being capable of switching between a state in which it engages with the latching means  62  when the rotating member  23  is in a non-rotating state and suppresses detachment of the rotating member  23  from the base member  22  and a state in which engagement with the latching means  62  is released when the rotating member  23  attains a rotatable state. 
     Four of the latching means  62  are disposed on the base member  22  side, a pair being disposed on each of opposite sides along the vehicle width direction of the base member  22  so as to be spaced in the fore-and-aft direction, and four of the engagement means  63  are provided on the rotating member  23  side, the engagement means  63  being capable of engaging with the latching means  62 . The latching means  62  and the engagement means  63  are spaced in the vehicle fore-and-aft direction and are disposed further rearward than the front end and further forward than the rear end of the rotating member  23  when viewed from the side in the vehicle width direction (see  FIG. 2 ). That is, the latching means  62  and the engagement means  63  are disposed between a first imaginary vertical plane IVA passing the front end of the rotating member  23  (see  FIG. 2 ) and a second imaginary vertical plane IVB passing the rear end of the rotating member  23  (see  FIG. 2 ). Moreover, as is clearly shown in  FIG. 3  the latching means  62  and the engagement means  63  are disposed further outside than the rotating member  23  at least in a plan view when the rotating member  23  is in the non-rotating state. 
     Referring in addition to  FIG. 9  to  FIG. 11 , the engagement means  63  includes a shaft support member  66  that is fixed directly or indirectly to the rotating member  23 , a shaft member  67  that is supported by the shaft support member  66 , and a hook member  68  that is pivotably and axially supported by the shaft member  67 . 
     The shaft support member  66  includes a shaft support wall portion  66   a  that is disposed outside the rotating member  23  in plan view while having fixed thereto the shaft member  67 , and a pair of extending wall portions  66   b  that are connectedly provided on the shaft support wall portion  66   a  at positions sandwiching the shaft member  67  therebetween and extend toward the rotating member  23  side. The extending wall portion  66   b  is fixed directly or indirectly to the rotating member  23 , and in this embodiment the extending wall portion  66   b  is fixed by welding, etc. to a support plate  69  fixed by welding, etc. to a lower face of the second collar portion  23   c  of the rotating member  23 . The hook member  68  is disposed outside the shaft support wall portion  66   a  and pivotably supported on the shaft member  67 . 
     The engagement means  63  is disposed at a position in which at least part of (part in this embodiment) of the engagement means  63  overlaps the rotating member  23  when viewed from the side, and is disposed at a position in which it avoids the movement means  36  in plan view and, in particular, is disposed outside the movement means  36  in plan view. As shown in  FIG. 2 , the engagement means  63  is disposed at a position in which at least the upper part of the engagement means  63  overlaps the seat cushion  12  when viewed from the side and at least part of (part in this embodiment) of the engagement means  63  overlaps the side frame  18  when viewed from the side. 
     The engagement means  63  are arranged so that they release engagement with the latching means  62  by pivoting toward the side on which, among the engagement means  63 , a lower part of the hook member  68  of the engagement means  63  disposed on the front side in the vehicle fore-and-aft direction of the rotating member  23  and a lower part of the hook member  68  of the engagement means  63  disposed on the rear side in the vehicle fore-and-aft direction of the rotating member  23  move away from each other. 
     On the other hand, the latching means  62  are disposed on opposite sides in the vehicle width direction of the base member  22  while being spaced in the vehicle fore-and-aft direction, and include a rod-shaped striker  70  that the hook member  68  can engage with and a striker support member  71  that supports the striker  70  and is fixed directly or indirectly to the base member  22 , in this embodiment the striker support member  71  being fixed to the base member  22  via the support bracket  42 . 
     The second latching means  62  includes the striker  70 , with which the hook member  68  can engage, and a second striker support member  71  that supports the striker  70  and is fixed directly or indirectly to the base member  22 , and in this embodiment the second striker support member  71  is fixed to the base member  22  via the support bracket  42 . 
     The first striker support member  71  is formed so as to have a substantially U-shaped cross-sectional shape while enabling the hook member  68  to be inserted into and disengaged therefrom, and the striker  70  is fixed to the striker support member  71  so as to straddle the striker support member  71 . 
     Among the latching means  62 , the striker support member  71  of the latching means  62  disposed on the front side in the vehicle fore-and-aft direction of the base member  22  is fixed to the base member  22  in an attitude in which it opens forward in the vehicle fore-and-aft direction, and the striker support member  71  of the latching means  62  disposed on the rear side in the vehicle fore-and-aft direction of the base member  22  is fixed to the base member  22  in an attitude in which it opens rearward in the vehicle fore-and-aft direction. 
     The striker  70  is disposed at a position lower than the lower end of the rotating member  23  when viewed from the side. That is, as is clearly shown in  FIG. 4  the striker  70  is disposed at a position lower than an imaginary horizontal plane IH passing the lower end of the rotating member  23 . 
     A second spring support member is secured to each of opposite end parts in the fore-and-aft direction on opposite sides in the vehicle width direction of the second collar portion  23   c  of the rotating member  23 , and a second coil spring  74  is provided between the second spring support member and the hook member  68  of the engagement means  63 , the second coil spring  74  being an urging member that pivotingly urges the hook member  68  in a direction in which it engages with the striker  70 . 
     The striker support member  71  is disposed on the outside in the vehicle width direction of the fixed rail  37  of the movement means  36 , and the striker support member  71  is secured to a mounting member  75  secured to the support bracket  42  by welding, etc. 
     Since the hook member  68  is disposed outside the shaft support member  66 , the part of the hook member  68  that is engaged with the striker  70  is set outside the shaft support member  66  in plan view. 
     The latching means  62  is fixed via the support bracket  42  to the base member  22  at a position in which the base member  22  overlaps at least part (part in this embodiment) of the latching means  62  when viewed from the side, and in plan view as shown in  FIG. 3  it is disposed further outside than the movement means  36 . 
     At least part (a lower part in this embodiment) of a specific one among the engagement means  63 , in this embodiment the engagement means  63  disposed on the rear side in the vehicle fore-and-aft direction among the engagement means  63 , is disposed so as to overlap the reclining lever  17  when viewed from the side as shown in  FIG. 2 . Moreover, as is clearly shown in  FIG. 3 , at least part of the specific engagement means  63  is disposed further outside than the reclining lever  17  in plan view. That is, at least part of the specific engagement means  63  is disposed further outside than a third imaginary vertical plane IVC that passes an end part, on the side opposite to the vehicle seat  11 , of the reclining lever  17  and extends in the fore-and-aft direction. 
     The hook member  68  of the engagement means  63  pivots in response to operation of the lock member  46  of the rotation-locking means  45 . Four cables  76  are provided between the lock member  46  and the hook member  68 , the cables  76  transmitting to the hook member  68  power for pivoting the hook member  68  against the spring force of the second coil spring  74  when the lock member  46  is pivoted from the locked position to the lock release position side. 
     The cable  76  is formed by movably inserting an inner cable  76   b  through the interior of an outer cable  76   a . One end part of four outer cables  76   a  is fixed to a common cable retaining member  77  fixed to the second collar portion  23   c  of the rotating member  23  so as to oppose the lock member  46 , and one end part of the inner cable  76   b  protruding via the one end part of each outer cable  76   a  is linked to the lock member  46 . Individual retaining members  78  of the cables are fixed to parts, corresponding to the four engagement means  63 , of the second collar portion  23   c  of the rotating member  23 , and the other end parts of the outer cables  76   a  are fixed to the individual retaining members  78 . The other end part of the inner cable  76   b  protruding via the other end part of each outer cable  76   a  is linked to the respective hook member  68 . 
     The operation of this embodiment is now explained. Since the latching means  62 , which is provided on the base member  22  side having the rotation support part  30  rotatably supporting the rotating member  23  supporting the vehicle seat  11 , and the engagement means  63 , which is provided on the rotating member  23  side so as to be capable of switching between a state in which it engages with the latching means  62  when the rotating member  23  is a non-rotating state and suppresses detachment of the rotating member  23  from the base member  22  and a state in which engagement with the latching means  62  is released when the rotating member  23  attains a rotatable state, are disposed further outside than the rotating member  23  in plan view at least when the rotating member  23  is in a non-rotating state, the latching means  62  and the engagement means  63  do not overlap the rotating member  23  in the height direction, and it is possible to form the rotating device compactly in the height direction while enabling detachment of the rotating member  23  to be suppressed by the latching means  62  and the engagement means  63 . 
     Furthermore, since the engagement means  63  is disposed at a position in which at least part of the engagement means  63  overlaps the rotating member  23  when viewed from the side, it is possible to suppress any increase in the height of the rotating device due to disposition of the engagement means  63 . 
     Moreover, since the latching means  62  is fixed to the base member  22  at a position in which at least part of the latching means  62  overlaps the base member  22  supported on the vehicle floor  35  when viewed from the side, it is possible to mount the base member  22  on the latching means  62  in advance when assembling the rotating device onto the vehicle floor  35 , thus enhancing the ease of assembly and also suppressing any increase in the height of the rotating device due to disposition of the latching means  62 . 
     Furthermore, since the engagement means  63  includes the shaft support member  66  fixed directly or indirectly to the rotating member  23 , the shaft member  67  supported by the shaft support member  66 , and the hook member  68  pivotably and axially supported by the shaft member  67 , the latching means  62  includes the striker  70 , with which the hook member  68  can engage, and the striker support member  71  supporting the striker  70  and directly or indirectly fixed to the base member  22 , and the part of the hook member  68  that engages with the striker  70  is set outside the shaft support member  66  in plan view, it is possible to make it easy for the striker  70  to receive a load when a detachment load is acting. 
     Moreover, since the striker  70  is disposed at a position lower than the lower end of the rotating member  23  when viewed from the side, it is possible to prevent the rotating member  23  from interfering with the striker  70  when the rotating member  23  is rotating while suppressing any increase in the height of the rotating device. 
     Furthermore, since the shaft support member  66  includes the shaft support wall portion  66   a  disposed outside the rotating member  23  in plan view while the shaft member  67  is fixed thereto, and the pair of extending wall portions  66   b  connectedly provided on the shaft support wall portion  66   a  at a position in which the shaft member  67  is sandwiched therebetween and extending to the rotating member  23  side, and the extending wall portions  66   b  are fixed directly or indirectly to the rotating member  23 , it is possible to enhance the bracing strength of the shaft support member  66  when a load is acting on the rotating member  23 . 
     Moreover, since the movement means  36 , which can move the base member  22  in the vehicle fore-and-aft direction, is provided, and the engagement means  63  is disposed at a position in which it avoids the movement means  36  in plan view, it is possible to suppress any increase in the height of the rotating device by preventing the movement means  36  and the engagement means  63  from overlapping each other in the height direction. 
     Furthermore, since the engagement means  63  is disposed outside the movement means  36  in plan view, the engagement means  63  is disposed on the part of the rotating device that is closer to the outside, and it is possible to receive a load from the vehicle seat  11  via part of the base member  22  that is further outside. 
     Moreover, since the movement means  36  is disposed between the vehicle floor  35  and the base member  22 , and the latching means  62  is disposed further outside than the movement means  36  in plan view, it is possible for a load from the vehicle seat  11  to be received by part of the base member  22  that is further outside while disposing the latching means  62  so as to avoid interference with the movement means  36 . 
     Furthermore, since the second coil spring  74 , which pivotingly urges the hook member  68  in a direction in which it engages with the striker  70 , is provided between the shaft support member  66  and the hook member  68 , it is possible to retain a state of engagement between the hook member  68  and the striker  70 . 
     Moreover, since the latching means  62  and the engagement means  63  are disposed at two locations on opposite sides of the base member  22  and the rotating member  23  in the vehicle width direction while being spaced in the vehicle fore-and-aft direction and disposed further rearward than the front end and further forward than the rear end of the rotating member  23  when viewed from the side in the vehicle width direction, it is possible to compactly dispose the latching means  62  and the engagement means  63  by disposing them further rearward than the front end and further forward than the rear end of the rotating member  23  while enabling the vehicle seat  11  to be retained in two attitudes that are rotated through 180 degrees. 
     Furthermore, since the pair of engagement means  63  disposed so as to be spaced in the vehicle fore-and-aft direction are formed with a structure that enables the hook members  68  to disengage from the strikers  70 , with which they have individually engaged, by pivoting lower end parts of the hook members  68  of the engagement means  63  toward the side on which they are moved away from each other in a state in which the vehicle seat  11  cannot rotate, it is possible to prevent the hook members  68  from interfering with each other when releasing engagement with the striker  70  in the non-rotatable state. 
     Moreover, since the engagement means  63  is disposed at a position in which at least an upper part of the engagement means  63  overlaps the seat cushion  12  of the vehicle seat  11  when viewed from the side, it is possible to suppress any increase in the height of the vehicle seat  11 . 
     Furthermore, since at least part of the specific engagement means  63 , which is at least one among the plurality of engagement means  63 , is disposed so that when viewed from the side it overlaps the reclining lever  17 , which operates so as to switch between a state in which the seat back  13 , which is tiltable with respect to the seat cushion  12 , can tilt and a state in which tilting is restricted, it is possible to suppress any increase in the height of the rotating device for the vehicle seat  11 , which includes the reclining lever  17 . 
     Moreover, since the seat cushion frame  15  supporting the seat cushion  12  is formed from the pair of side frames  18  positioned so as to be spaced from each other and extending linearly, and the pan frame  19  and rear pipe  20  providing a link between opposite end parts of the side frames  18 , and at least part of the engagement means  63  is disposed at a position in which it overlaps the side frame  18  when viewed from the side, it is possible to suppress any increase in the height of the rotating device for the vehicle seat  11 . 
     Furthermore, since the reclining lever  17  is disposed on the outside, in plan view, of one side frame  18  of the pair of side frames  18 , and at least part of the specific engagement means  63  is disposed further outside than the reclining lever  17  in plan view, it is possible for a load acting from the vehicle seat  11  to be received by part of the base member  22  that is further outside. 
     An embodiment of the present invention is explained above, but the present invention is not limited to the embodiment and may be modified in a variety of ways as long as the modifications do not depart from the subject matter thereof. 
     In the above embodiment, the vehicle seat  11  is explained as a vehicle interior item, but it is not limited to the vehicle seat  11 . 
     Embodiments of Solution Means for Second Problem 
     Embodiments of the present invention are explained by reference to the attached drawings. In the explanation below, ‘fore and aft’, ‘left and right’ and ‘up and down’ refer to directions viewed by an occupant when a vehicle seat is in an attitude in which the occupant seated thereon faces forward. 
     A first embodiment of the present invention is explained below by reference to  FIG. 12  to  FIG. 19 . First, in  FIG. 12  and  FIG. 13 , a seat  111  of a vehicle seat device  110  mounted in a vehicle includes a seat cushion  112  that forms a seat part for an occupant and a seat back  113  that is disposed above the seat cushion  112 , a side cover  114  is disposed on each of opposite sides of the seat cushion  112 , and a headrest  115  for receiving a head part of the occupant is disposed on an upper part of the seat back  113 . 
     Referring in addition to  FIG. 14 , the vehicle seat device  110  includes a pair of slide rails  116  that are arranged in parallel to each other while being spaced in the left-and-right direction in order to make the seat  111  slidable and that extend linearly, and a rotation mechanism  117  that can move along the slide rail  116  while rotatably supporting the seat  111 . 
     A seat frame  118  of the vehicle seat device  110  includes a seat cushion frame  119  that supports the seat cushion  112  and a seat back frame  120  that is linked to the seat cushion frame  119  so as to support the seat back  113  disposed above the seat cushion  112 . 
     The seat cushion frame  119  has a pair of side frames  119   a  that are disposed so as to extend linearly in the fore-and-aft direction at positions spaced from each other in the left-and-right direction, a pan frame  119   b  that provides a link between front end parts of the side frames  119   a , and a rear pipe  119   c  that provides a link between rear end parts of the pair of side frames  119   a.    
     A cushion-side pressure-receiving member  121  bridges between the pan frame  119   b  and the rear pipe  119   c . The cushion-side pressure-receiving member  121  has a plurality (four in this embodiment) of seat springs  122  that are formed by curving a metal wire in a zig-zag so as to snake to the left and right, these seat springs  122  being disposed so that adjacent seat springs  122  have lateral symmetry and the adjacent seat springs  122  being linked to each other by means of a plurality of intermediate linking members  123  that are made of a resin and molded by insertion molding so as to be integral with the seat spring  122 . 
     Front end parts of the plurality of seat springs  122  are each engaged with latching parts  124  provided on the pan frame  119   b  of the seat frame  118 . Rear end parts of the mutually adjacent seat springs  122  are engaged with the rear pipe  119   c  of the seat frame  118  and are linked by means of a rear end part-linking member  125  that is made of a resin and molded by insertion molding so as to be integral with the seat spring  122 , the rear end part-linking member  125  being formed so as to cover the rear pipe  119   c.    
     The seat back frame  120  has a pair of seat back side frames  120   a  that extend in the up-and-down direction at positions spaced from each other in the left-and-right direction, an upper frame  120   b  that provides a link between upper end parts of the seat back side frames  120   a , and a lower frame  120   c  that provides a link between lower end parts of the pair of seat back side frames  120   a.    
     A back-side pressure-receiving member  126  formed from a resin, etc. so as to be elastically deformable is disposed between the pair of seat back side frames  120   a , the back-side pressure-receiving member  126  bridging between the left and right seat back side frames  120   a  via an upper link wire  127  and a lower link wire  128 . 
     Referring in addition to  FIG. 15  and  FIG. 16 , the seat frame  118  is placed on the rotation mechanism  117 , the rotation mechanism  117  including a base member  129  that can move along the slide rail  116 , an annular rotating member  130  that supports the seat frame  118  and is rotatably supported on the base member  129 , and a cover member  131  that is fixed to the base member  129  while covering part of the rotating member  130  from above. 
     The base member  129  has an annular first bottom wall portion  129   a , a cylindrical first side wall portion  129   b  that rises upward from an outer peripheral part of the first bottom wall portion  129   a , and a first collar portion  129   c  that protrudes outward from an upper end part of the first side wall portion  129   b , the first collar portion  129   c  being formed into a rectangular shape. The base member  129  is disposed further inside than a middle part in the width direction of the pair of slide rails  116  and beneath the cushion-side pressure-receiving member  121 . 
     The cover member  131  has an annular second bottom wall portion  131   a  that abuts against the first bottom wall portion  129   a  of the base member  129  from above, a cylindrical second side wall portion  131   b  that rises slightly upward from the outer periphery of the second bottom wall portion  131   a , a first taper portion  131   c  that is formed so as to have a larger diameter in going upward and is connectedly provided on an upper end part of the second side wall portion  131   b , an annular first flat wall portion  131   d  that is connected to an upper end part of the first taper portion  131   c , and a cylindrical third side wall portion  131   e  that rises upward from the outer periphery of the first flat wall portion  131   d , the second bottom wall portion  131   a  being joined to the first bottom wall portion  129   a  of the base member  129  by a plurality of rivets  132 . 
     The rotating member  130  has a second taper portion  130   a  that is disposed at a position opposing the first taper portion  131   c  of the cover member  131  from the outside and is formed so as to have a larger diameter in going upward, a cylindrical third side wall portion  130   b  that rises upward from an upper end part of the second taper portion  130   a  so as to oppose the second side wall portion  131   b  of the cover member  131  from the outside, and a second collar portion  130   c  that protrudes outward from the third side wall portion  130   b , the second collar portion  130   c  being formed into a rectangular shape. The side frame  119   a  of the seat cushion frame  119  of the seat frame  118  is fastened to the second collar portion  130   c  via pluralities of first bolts  134  and second nuts  135 . 
     The rotating member  130  is rotatably supported on an annular rotation support part  136  of the base member  129  via a bearing  137 , the rotation support part  136  being formed from the first bottom wall portion  129   a  and the first side wall portion  129   b  of the base member  129  so that its cross-sectional shape is substantially L-shaped. 
     The bearing  137  is formed by retaining balls  139  at a plurality of locations in the peripheral direction of an annular retainer  138 , and an annular recess part  140  for the balls  139  to roll in is formed in the second taper portion  130   a  of the rotating member  130 . 
     The slide rail  116  is formed from a fixed rail  141  that is fixed to a vehicle floor face  133 , and a movable rail  142  that is slidably fitted to the fixed rail  141 . Formed on the floor face  133  is a convex portion  133   a  that protrudes upward while extending in the vehicle fore-and-aft direction. Fixing the fixed rail  141  onto the convex portion  133   a  enables a lower part of the rotation mechanism  117  to be disposed at a position lower than the lower end of the slide rail  116  in the up-and-down direction. 
     A support bracket  143  is connectedly provided on the movable rail  142 , the support bracket  143  extending toward the inside of the pair of slide rails  116  and being formed integrally with or separately from the movable rail  142  (in this embodiment separately), and the base member  129  is fastened to the support bracket  143  via a second bolt  145  and a second nut  146  screwed onto the second bolt  145 . That is, the base member  129  is fixedly linked to the movable rail  142  via the support bracket  143 . 
     The support bracket  143  is formed so as to integrally have a flat plate-shaped mounting plate portion  143   a  that is disposed on the movable rail  142  so that a lower face thereof is fixed to the movable rail  142  by welding, etc., a side-plate portion  143   b  that is connected to the mounting plate portion  143   a  at right angles while extending in the up-and-down direction at a position adjacent to the inner side of the slide rail  116 , and a flat plate-shaped linking plate portion  143   c  that extends from the lower end of the side-plate portion  143   b  toward the side opposite to the slide rail  116  and abuts against the first collar portion  129   c  of the base member  129  from below. The linking plate portion  143   c  is fastened to the first collar portion  129   c  of the base member  129 . 
     A first hook member  147  is fixed to the side-plate portion  143   b  of the support bracket  143  by welding, etc., and a second hook member  148  that forms, in cooperation with the first hook member  147 , a deformation-suppressing mechanism  149  that suppresses upward lifting of the rotating member  130  with respect to the movable rail  142  is fixed to the third side wall portion  130   b  of the rotating member  130  by welding, etc. and engaged with the first hook member  147  while allowing the rotating member  130  to rotate. 
     The first hook member  147  is fixed to the support bracket  143  via a total of four positions corresponding to front end parts and rear end parts of the pair of left and right movable rails  142 , and the second hook member  148  is fixed to the third side wall portion  130   b  of the rotating member  130  via four positions corresponding to the first hook member  147 . 
     Referring in addition to  FIG. 17  and  FIG. 18 , it is possible to switch between a locked state of the rotating member  130  in which it is locked with respect to the base member  129  and the cover member  131  and release of the locked state by means of operation of a lock member  152  supported on the rotating member  130 , and a rattle-suppressing member  153  that operates in association with operation of the lock member  152  is disposed between the cover member  131  and the rotating member  130 . 
     A tapered push-out member  154  whose diameter increases in going upward is disposed between the first taper portion  131   c  of the cover member  131  and the second taper portion  130   a  of the rotating member  130 . A housing hole  155  extending lengthwise in the peripheral direction of the push-out member  154  is provided in a plurality of locations, spaced in the peripheral direction, of the push-out member  154 , and the rattle-suppressing member  153  disposed between the first taper portion  131   c  of the cover member  131  and the second taper portion  130   a  of the rotating member  130  is housed in the housing hole  155 . 
     On the other hand, the lock member  152  is pivotably supported on the rotating member  130  via a shaft  151  having a vertical axis, and can pivot between a locked position in which as shown in  FIG. 17 ( a )  it engages with the first taper portion  131   c  of the cover member  131  and prevents rotation of the rotating member  130  and a lock release position in which as shown in  FIG. 17 ( b )  the engagement with the first taper portion  131   c  is released and rotation of the rotating member  130  is allowed, the lock member  152  being pivotingly urged toward the locked position side by means of a spring  156 . 
     A link arm portion  152   a  of the lock member  152  is inserted through a through hole  157  formed in the second taper portion  130   a  of the rotating member  130 , an extremity part of the link arm portion  152   a  can be inserted into a link hole  158  formed in the push-out member  154 , and inserting the extremity part of the link arm portion  152   a  through the link hole  158  links the lock member  152  to the push-out member  154 . The link arm portion  152   a  is linked to the link hole  158  when the lock member  152  attains the lock release position as shown in  FIG. 17 ( b ) , and the link arm portion  152   a  applies a pushing force to the push-out member  154  in the pivoting direction. 
     An engagement arm portion  152   b  of the lock member  152  engages with a first through hole  159  formed in the second taper portion  130   a  of the rotating member  130  and a second through hole  160  formed in the first taper portion  131   c  of the cover member  131  when the lock member  152  is at the locked position shown in  FIG. 17 ( a ) , but disengages from the second through hole  160  to thus release engagement with the cover member  131  when it is at the lock release position shown in  FIG. 17 ( b ) . The engagement arm portion  152   b  operates between the locked position and the lock release position so as to straddle the push-out member  154 . 
     Formed in the second taper portion  130   a  of the rotating member  130  is a recess part  161  that houses part of the rattle-suppressing member  153  and enables the rattle-suppressing member  153  to be closely fitted thereinto. 
     The rattle-suppressing member  153  is formed into a wedge shape so as to have an inclined face  153   a  whose height gradually decreases in going forward in a direction of movement  162  in which the push-out member  47  moves in response to the lock member  152  operating from the lock release position toward the locked position side, and the recess part  161 , which enables the rattle-suppressing member  153  to be closely fitted therein, is formed into a triangular shape so as to house part of the rattle-suppressing member  153  while having a recess part-side inclined face  161   a  opposing the inclined face  153   a.    
     A coil spring  163  is provided in a compressed state between the rattle-suppressing member  153  and, among longitudinally opposite end parts of the housing hole  151  formed in the push-out member  154 , a front end part along the direction of movement  162 . The rattle-suppressing member  153  is urged in a direction opposite to the direction of movement  162  by a spring force exerted by the coil spring  163 . 
     When the lock member  152  is at the locked position, as shown in  FIG. 17 ( a )  the inclined face  153   a  of the rattle-suppressing member  153  abuts closely against the recess part-side inclined face  161   a  of the recess part  161  to thus put the rattle-suppressing member  153  in close contact with the rotating member  130  and the cover member  131 , thereby preventing the rotating member  130  from rattling. 
     When the lock member  152  attains the lock release position, as shown in  FIG. 17 ( b ) , among the longitudinally opposite end parts of the housing hole  151 , a rear end part along the direction of movement  162  abuts against the rattle-suppressing member  153 , the rattle-suppressing member  153  is pushed in the direction of movement against the urging force of the coil spring  163 , and the rattle-suppressing member  153  moves toward the side on which the inclined face  153   a  of the rattle-suppressing member  153  moves away from the recess part-side inclined face  161   a , thus releasing the state in which rattling is prevented. 
     Referring in addition to  FIG. 19 , at least part, along the peripheral direction, of the outer periphery of an upper part of the rotating member  130  of the rotation mechanism  117  is covered by a cover  165  from the outside, and in this embodiment in a state in which an occupant seated on the seat cushion  112  faces forward in the vehicle fore-and-aft direction the cover  165  is disposed at a position in which it covers an upper part of the third side wall portion  130   b  of the rotating member  130  and the second collar portion  130   c  from the rear. 
     Moreover, in a state in which an occupant seated on the seat cushion  112  faces forward in the vehicle fore-and-aft direction, a skin  112   a  of the seat cushion  112  is linked to the rear edge of an upper end part of the rotating member  130 , that is, the rear edge of the second collar portion  130   c , and an upper part of the cover  165  is connected so as to be in contact with a part of the skin  112   a  that is linked to the second collar portion  130   c.    
     The cover  165  is mounted on the pair of side frames  119   a  forming part of the seat cushion frame  119  via a mounting arm  166  (see  FIG. 16 ). 
     The cover  165  integrally has a flat plate-shaped upper plate  165   a , a lower plate  165   b  that opposes the upper plate  165   a  from below, a linking plate  165   c  that provides a link between end parts, on the side opposite to the rotating member  130 , of the upper plate  165   a  and the lower plate  165   b , and an end wall  165   d  that provides a link between opposite ends in the width direction of the upper plate  165   a , the lower plate  165   b , and the linking plate  165   c . An outside face of the cover  165 , that is, an outside face of the linking plate  165   c , is formed into an arc shape that protrudes outward of the rotating member  130 . 
     A fixed cover member  167  that covers at least the base member  129  from the rear in a state in which an occupant seated on the seat cushion  112  faces forward in the vehicle fore-and-aft direction is fixedly disposed beneath the cover  165 , the fixed cover member  167  being mounted on for example a rear end part in the vehicle fore-and-aft direction of the fixed rail  141  of the slide rail  116 . 
     In the same manner as for the cover  165 , the fixed cover member  167  integrally has a flat plate-shaped upper plate  167   a , a lower plate  167   b  that opposes the upper plate  167   a  from below, a linking plate  167   c  that provides a link between end parts, on the side opposite to the rotating member  130 , of the upper plate  167   a  and the lower plate  167   b , and an end wall  167   d  that provides a link between end parts, in the width direction, of the upper plate  167   a , the lower plate  167   b , and the linking plate  167   c . An outside face of the linking plate  167   c  is formed into an arc shape that protrudes outward of the rotating member  130 . 
     The fixed cover member  167  is in relatively slidable contact with a lower part of the cover  165 , the upper plate  167   a  of an upper end part of the fixed cover member  167  being in relatively slidable contact with a lower face of the lower plate  165   b  of the cover  165 . 
     The side frame  119   a  is covered by the side cover  114  from the outside, and as shown in  FIG. 15  the lower end position of the side cover  114  is set so as to be present slightly above an upper face of the mounting plate portion  143   a  of the support bracket  143  in the up-and-down direction, and as shown in  FIG. 13  the position in the up-and-down direction is the same as the lower end position of the cover  165 . 
     The operation of the first embodiment is now explained. Since at least part, along the peripheral direction, of the outer periphery of an upper part of the rotating member  130  forming part of the rotation mechanism  117  of the vehicle seat device  110  is covered by the cover  165  from the outside, it is possible to suppress the entry of foreign matter into the rotation mechanism  117  via at least a part that is covered by the cover  165 . 
     Furthermore, since the cover  165  is disposed at a position in which it covers the outer periphery of an upper part of the rotating member  130  from the rear in a state in which an occupant seated on the seat cushion  112  faces forward in the vehicle fore-and-aft direction, it is possible to suppress the entry of foreign matter into the rotation mechanism  117  from the rear passenger seat side in a state in which a driver&#39;s seat or a passenger seat faces forward. 
     Moreover, since the skin  112   a  of the seat cushion  112  is linked to the rear edge of an upper end part of the rotating member  130  while being in contact with the outer face of the cover  165  in a state in which an occupant seated on the seat cushion  112  faces forward in the vehicle fore-and-aft direction, it is possible to connect an upper part of the cover  165  to the skin  112   a  of the seat cushion  112  so as to be in contact therewith, and it is possible to suppress more effectively the entry of foreign matter into the rotation mechanism  117  from the rear passenger seat side in a state in which a driver&#39;s seat or a passenger seat faces forward. 
     Furthermore, since the seat cushion frame  119  has the pair of side frames  114 , which extend linearly and are supported on the rotating member  130 , and the cover  165  is mounted on the side frames  114 , it is possible to rotate the cover  165  together with the seat  111  by a simple structure. 
     Moreover, since the outside face of the cover  165  is formed into an arc shape that protrudes outward of the rotating member  130 , when the cover  165  rotates together with the seat  111 , even if the cover  165  comes into contact with luggage, etc. on the floor within the vehicle compartment, it is possible to realize smooth rotation of the cover  165  and consequently the seat  111 . 
     Furthermore, since the fixed cover member  167  is fixedly disposed beneath the cover  165 , which covers at least the base member  129  from the rear in a state in which an occupant seated on the seat cushion  112  faces forward in the vehicle fore-and-aft direction, it is possible to suppress the entry of foreign matter into the rotation mechanism  117  from the rear passenger seat side in a state in which a driver&#39;s seat or a passenger seat faces forward. 
     Moreover, since the fixed cover member  167  is in relatively slidable contact with the lower part of the cover  165 , it is possible to suppress more effectively the entry of foreign matter into the rotation mechanism  117  from the rear passenger seat side in a state in which a driver&#39;s seat or a passenger seat faces forward. Furthermore, since the outside face of the fixed cover member  167  is formed into an arc shape that protrudes outward of the rotating member  130  in the same manner as for the cover  165 , which is present above the fixed cover member  167 , it is possible to suppress as much as possible the occurrence of a gap between the fixed cover member  167  and the seat  111 , including the cover  165 , while the seat  111  is partway through rotation, and it is possible to suppress effectively the entry of foreign matter into the rotation mechanism  117 . 
     Moreover, since the position of the lower end of the side cover  114  covering the seat cushion  112  from the outside is set to be the same as the position of the lower end of the cover  165 , it is possible to suppress the entry of foreign matter into the rotation mechanism  117  from the rear passenger seat side in a state in which a driver&#39;s seat or a passenger seat is facing in the vehicle width direction. 
       FIG. 20  shows a second embodiment of the present invention; parts corresponding to those of the first embodiment are denoted by the same reference numerals and symbols and are only illustrated, detailed description thereof being omitted. 
     The rotation mechanism  117  is disposed beneath a seat cushion  172  forming a seat  171  together with the seat back  113 , and a cover-mounting plate  174  that protrudes rearward in the vehicle fore-and-aft direction in a state in which an occupant seated on the seat cushion  172  faces forward in the vehicle fore-and-aft direction is fixed to the second taper portion  130   a  of the rotating member  130  forming part of the rotation mechanism  117 . 
     On the other hand, part of a skin  172   a  of the seat cushion  172  is extended downward so as to form a cover  175  covering the outer periphery of the upper part of the rotating member  130  from the rear in a state in which an occupant seated on the seat cushion  172  faces forward in the vehicle fore-and-aft direction, the lower edge of the cover  175  is fixedly linked to the cover-mounting plate  174 , and in this embodiment a hook  176  secured to the lower edge of the cover  175  by sewing is engaged with the edge of the cover-mounting plate  174 . The cover  175  is thereby fixedly linked to the cover-mounting plate  174  while covering the outer periphery of the upper part of the rotating member  130  from the rear in a state in which an occupant seated on the seat cushion  172  faces forward in the vehicle fore-and-aft direction, but the lower edge of the cover  175  may be secured directly to the cover-mounting plate  174  by adhesion, etc. 
     A fixed cover member  177  that covers at least the base member  129  from the rear in a state in which an occupant seated on the seat cushion  172  faces forward in the vehicle fore-and-aft direction is fixedly disposed beneath the cover  175 . 
     The fixed cover member  177  is mounted on for example a rear end part in the vehicle fore-and-aft direction of the fixed rail  141  of the slide rail  116 , and is formed so as to integrally have a flat plate-shaped vertical wall portion  177   a  that extends in the up-and-down direction along a plane orthogonal to the longitudinal direction of the slide rail  116 , and a flat plate-shaped protruding plate portion  177   b  that protrudes from the upper end of the vertical wall portion  177   a  rearward in the vehicle fore-and-aft direction. 
     The rear edge, in the vehicle fore-and-aft direction, of the protruding plate portion  177   b  is in contact with the hook  176 , and is formed into an arc shape having the rotational axis of the rotating member  130  as the center in order to ensure smooth rotation of the hook  176 , which rotates together with the rotating member  130 . 
     In accordance with the second embodiment, since the cover  175  is formed from the skin  172   a  of the seat cushion  172 , it is possible to avoid any increase in the number of components when suppressing the entry of foreign matter into the rotation mechanism  117 . 
       FIG. 21  shows a third embodiment of the present invention; parts corresponding to those of the first and second embodiments are denoted by the same reference numerals and symbols and are only illustrated, detailed description thereof being omitted. 
     At least part along the peripheral direction of the outer periphery of the upper part of the rotating member  130  (see first and second embodiments) of the rotation mechanism  117  is covered by a cover  178  from the outside, and in this embodiment it is covered by the cover  178  from the rear in a state in which an occupant seated on the seat cushion  112  faces forward in the vehicle fore-and-aft direction. 
     The cover  178  is basically formed in the same manner as for the cover  165  of the first embodiment, and is formed integrally with at least one of the pair of side covers  114  covering from the outside the pair of side frames  112  (see first embodiment) forming part of the seat cushion frame  112 . The position of the lower end of the side cover  114  is set to be the same as the position of the lower end of the cover  177 , and the fixed cover member  167  is fixedly disposed beneath the cover  178 . 
     Embodiments of the present invention are explained above, but the present invention is not limited to the embodiments and may be modified in a variety of ways as long as the modifications do not depart from the subject matter thereof. 
     For example, in the embodiments above, the arrangement is such that that the cover  165 ,  178  rotates together with the seat  111 ,  171 , but the cover  165 ,  178  may be present at a fixed position. 
     Embodiment of Solution Means for Third Problem 
     An embodiment of the present invention is explained below by reference to the attached drawings. In the explanation below, ‘fore and aft’, ‘left and right’ and ‘up and down’ refer to directions viewed by a person seated on a seat in a normal attitude facing forward. 
     First, in  FIG. 22 , a vehicle seat device includes a pair of slide rails  213  that extend linearly while being arranged in parallel to each other and spaced in the left-and-right direction in order for a seat main body  211  to be slidable, and a rotation mechanism  214  that rotatably supports the seat main body  211  and can move along the slide rails  213 . 
     The seat main body  211  includes a seat cushion  211   a  that is supported on a seat cushion frame  216 , a seat back  211   b  that is supported on a seat back frame  217  linked to the seat cushion frame  216  and disposed above the seat cushion  211   a , and a headrest  211   c  supported by a guide tube  218  provided on the seat back frame  216  so that the height can be adjusted. 
     The seat cushion frame  216  has a pair of side frames  216   a  that are disposed so as to extend linearly in the fore-and-aft direction at positions spaced from each other in the left-and-right direction, a pan frame  216   b  that provides a link between front end parts of the side frames  216   a , and a rear pipe  216   c  that provides a link between rear end parts of the pair of side frames  216   a.    
     Referring in addition to  FIG. 23  and  FIG. 24 , mounted on the seat cushion frame  216  is a cushion-side pressure-receiving member  219  that receives a load from above the seat cushion  211   a . The cushion-side pressure-receiving member  219  has a plurality (four in this embodiment) of seat springs  220  that are formed by curving a metal wire in a zig-zag so as to snake to the left and right, these seat springs  220  being disposed so that adjacent seat springs  220  have lateral symmetry and the adjacent seat springs  220  being linked to each other by means of a plurality of intermediate linking members  221  that are made of a resin and molded by insertion molding so as to be integral with the seat spring  220 . 
     Front end parts of the plurality of seat springs  220  are each engaged with latching parts  222  provided on the pan frame  216   b  of the seat cushion frame  216 . Rear end parts of the mutually adjacent seat springs  220  are engaged with the rear pipe  216   c  of the seat cushion frame  216  and are linked by means of a rear end part-linking member  223  that is made of a resin and molded by insertion molding so as to be integral with the seat spring  220 , the rear end part-linking member  223  being formed so as to cover the rear pipe  216   c.    
     That is, the cushion-side pressure-receiving member  219  bridges between the pan frame  216   b  and the rear pipe  216   c  of the seat cushion frame  216  and is disposed between the pair of side frames  216   a  in plan view. Moreover, as shown in  FIG. 24  a majority of the cushion-side pressure-receiving member  219  is inclined downward to the rear and bridges between the pan frame  216   b  and the rear pipe  216   c  so that a lowest end  219   a  of the cushion-side pressure-receiving member  219  is present in the vicinity of the rear pipe  216   c  in a rear end part of the seat cushion frame  216 . 
     Referring again to  FIG. 22 , the seat back frame  217  has a pair of seat back side frames  217   a  that extend in the up-and-down direction at positions spaced from each other in the left-and-right direction, an upper frame  217   b  that provides a link between upper end parts of the seat back side frames  217   a , and a lower frame  217   c  that provides a link between lower end parts of the pair of seat back side frames  217   a.    
     A back-side pressure-receiving member  224  formed from a resin, etc. so as to be elastically deformable is disposed between the pair of seat back side frames  217   a , and the back-side pressure-receiving member  224  bridges between the left and right seat back side frames  217   a  via an upper link wire  225  and a lower link wire  226 . 
     Referring in addition to  FIG. 25  to  FIG. 27 , the seat cushion frame  216  is placed on the rotation mechanism  214 , the rotation mechanism  214  including a base member  229  that can move along the slide rails  213 , a rotating member  230  that supports the seat cushion frame  216  and is rotatably supported on the base member  229 , and a cover member  231  that is fixed to the base member  229  while covering part of the rotating member  230  from above. 
     The base member  229  has an annular first bottom wall portion  229   a , a cylindrical first side wall portion  229   b  that rises upward from an outer peripheral part of the first bottom wall portion  229   a , and a first collar portion  229   c  that protrudes outward from an upper end part of the first side wall portion  229   b , the first collar portion  229   c  being formed into a rectangular shape. 
     The cover member  231  has an annular second bottom wall portion  231   a  that abuts against the first bottom wall portion  229   a  of the base member  229  from above, a cylindrical second side wall portion  231   b  that rises slightly upward from the outer periphery of the second bottom wall portion  231   a , a first taper portion  231   c  that is formed so as to have a larger diameter in going upward and is connectedly provided on an upper end part of the second side wall portion  231   b , an annular first flat wall portion  231   d  that protrudes sideways from an upper end part of the first taper portion  231   c , and a cylindrical third side wall portion  231   e  that rises upward from the outer periphery of the first flat wall portion  231   d , the second bottom wall portion  231   a  being joined to the first bottom wall portion  229   a  of the base member  229  by a plurality of rivets  232 . 
     The rotating member  230  has a second taper portion  230   a  that is disposed at a position opposing the first taper portion  231   c  of the cover member  231  from the outside and is formed so as to have a larger diameter in going upward, a cylindrical fourth side wall portion  230   b  that rises upward from an upper end part of the second taper portion  230   a  so as to oppose the third side wall portion  231   e  of the cover member  231  from the outside, and a second collar portion  230   c  that protrudes outward from the fourth side wall portion  230   b , the second collar portion  230   c  being formed into a rectangular shape. A linking member  233  extending in parallel with the slide rail  213  is fastened to the second collar portion  230   c  by means of pluralities of first bolts  234  and second nuts  235 . The side frame  216   a  of the seat cushion frame  216  is linked to the linking member  233 , and the side frames  216   a  extend linearly while being arranged at positions spaced from each other and are fixedly disposed on the second collar portion  230   c  of the rotating member  230  via the linking member  233 . 
     The rotating member  230  is rotatably supported on an annular rotation support part  236  of the base member  229  via a bearing  237 , the rotation support part  236  being formed from the first bottom wall portion  229   a  and the first side wall portion  229   b  of the base member  229  so that its cross-sectional shape is substantially L-shaped. 
     The bearing  237  is formed by retaining balls  239  at a plurality of locations in the peripheral direction of an annular retainer  238 , and an annular recess part  240  for the balls  239  to roll in is formed in the second taper portion  230   a  of the rotating member  230 . 
     A housing part  241  opening at least upward is formed in a central part of the rotating member  230 . In this embodiment, the housing part  241  is arranged so as to open both upward and downward via the second taper portion  230   a  and the fourth side wall portion  230   b  of the rotating member  230 , and the cover member  231  is housed and disposed within the housing part  241 . 
     The slide rail  213  is formed from a fixed rail  245  that extends in the vehicle fore-and-aft direction and a movable rail  246  that is slidably fitted to the fixed rail  245 , the first collar portion  229   c  of the base member  229  being fastened to the movable rail  246  by means of pluralities of second bolts  247  and second nuts  248 . 
     The rotating member  230  is rotatingly driven by a rotating device  249  that is provided between the rotating member  230  and the base member  229 , the rotating device  249  including an actuator  250 , an output gear  251  that is rotated by rotational power exerted by the actuator  250 , and an input gear  252  that meshes with the output gear  251 . 
     The actuator  250  and the output gear  251  are mounted on one of the rotating member  230  and the base member  229 , and the input gear  252  is fixed to the other of the rotating member  230  and the base member  229 . 
     Moreover, the actuator  250  is mounted on that one of the base member  229  and the rotating member  230  that is longer in the up-and-down direction, and in this embodiment the actuator  250  is mounted on the rotating member  230  side and the input gear  252  is fixed to the base member  229 . 
     The actuator  250  includes an electric motor  253  that has a rotational axis extending in the vehicle width direction, a gear box  255  that is linked to a case  254  of the electric motor  253 , and an output shaft  256  that protrudes from the gear box  255  with its rotational axis parallel to a rotational axis  2 C of the rotating member  230 , the output gear  251  being provided on the output shaft  256 . A gear reduction mechanism (not illustrated) that transmits the rotational power of the electric motor  253  to the output shaft  256  by changing the rotational direction through 90 degrees and decreasing the speed is housed within the gear box  255 , this gear reduction mechanism including a worm gear so as to prevent the rotational power from the output shaft  256  side from being transmitted toward the electric motor  253  side. 
     The rotating member  230  is rotatingly driven through a range of 180 degrees, the input gear  252  is formed into an arc shape of substantially 180 degrees while having a gear portion  252   a  on the inner peripheral part, and the gear portion  252   a  is fixed to a lower face of the inner peripheral part of the first bottom wall portion  229   a  of the base member  229  so as to protrude radially inward from the inner periphery of the first bottom wall portion  229   a . The gear portion  252   a  is thereby disposed so as to face toward the rotational axis  2 C of the rotating member  230 . 
     When fixing the input gear  252  to the base member  229 , some of the plurality of rivets  232  that are used to join the second bottom wall portion  231   a  of the cover member  231  to the first bottom wall portion  229   a  of the base member  229  are used for joining the second bottom wall portion  231   a  and the input gear  252  together to the first bottom wall portion  229   a  with the first bottom wall portion  229   a  sandwiched therebetween. In this arrangement, when an end part in the peripheral direction of the input gear  252  is disposed at a position corresponding to the rivet  232  for joining both the second bottom wall portion  231   a  and the input gear  252  together to the first bottom wall portion  229   a , in order to avoid the input gear  252  having a wasteful length in the peripheral direction, as shown in  FIG. 26  a cutout  257  may be formed in the end part in the peripheral direction of the input gear  252 . 
     Mounted on the rotating member  230  is a mounting member  258  that is disposed further inside than an outer periphery  230   d  of the rotating member  230  in plan view, and mounted on the mounting member  258  is the actuator  250 , which includes the electric motor  253 . That is, the gear box  255  of the actuator  250  is mounted on an upper face of the mounting member  258 , and the output gear  251  is provided on the output shaft  256 , which extends through the mounting member  258 . 
     The mounting member  258  is disposed further forward than the rotational axis  2 C of the rotating member  230 . The mounting member  258  extends so as to be orthogonal to the longitudinal direction of the slide rail  213  while having on opposite end parts joining plate portions  258   a  that are joined to an upper face of the third collar portion  230   c  of the rotating member  230 , and are formed so as to integrally have the pair of joining plate portions  258   a , a pair of left and right inclined plate portions  258   b  that are provided so as to be connected to the joining plate portions  258   a  via an upper end part while being inclined downward in going radially inward of the rotating member  230 , and a flat supporting plate portion  258   c  that provides a connection between lower ends of the inclined plate portions  258   b.    
     Since the inclined plate portion  258   b  is disposed within the housing part  241  in the central part of the rotating member  230  while opposing the first taper portion  231   c  of the cover member  231  from the inside, and the second taper portion  230   a  of the rotating member  230  opposes the first taper portion  231   c  from the outside, the inclined plate portion  258   b  is disposed within the housing part  241  while being inclined along the second taper portion  230   a  of the rotating member  230 . 
     The actuator  250  is mounted on an upper face of the supporting plate portion  258   c  of the mounting member  258 , and in a state in which it is mounted on the mounting member  258  the actuator  250  is disposed beneath the cushion-side pressure-receiving member  219  while avoiding interference with the cushion-side pressure-receiving member  219 . 
     Disposed between the first taper portion  231   c  of the cover member  231  and the second taper portion  230   a  of the rotating member  230  is an annular slider  260  that is in sliding contact with each of the taper portions  231   c ,  230   a . The slider  260  is employed in order to share the cover member  231  and the rotating member  230  with a vehicle seat device in which the rotating member  230  is rotated by applying manual power to the rotation mechanism  214  instead of electric power by means of the actuator  250 . In a vehicle seat device in which rotation by manual power is made possible, instead of the slider  260 , an annular member forming part of a mechanism that suppresses rattling of the rotating member  230  in a locked state in which rotation of the rotating member  230  is prevented is disposed between the first taper portion  231   c  and the second taper portion  230   a.    
     A blower  265  is disposed further rearward than the front edge of the pan frame  216   b  forming a front part of the seat cushion frame  216 , and a duct  266  having one end portion  266   a  connected to the blower  265  has an opening  267  formed in the other end portion  266   b , which functions as a blower outlet. 
     As shown in  FIG. 24  the blower  265  is mounted on a lower part of the pan frame  216   b  via a support member  268 , and the opening  267  is disposed on the radially inner side of the annular rotating member  230  and on the radially inner side of the cover member  231  in plan view. The opening  267  opens toward the seat cushion  211   a  side, and is disposed in plan view as is clearly shown in  FIG. 23  between a pair of seat springs  220  that are adjacent to each other among a plurality of seat springs  220  forming the cushion-side pressure-receiving member  219 . 
     The other end portion  266   b  of the duct  266  protrudes slightly so as to be higher than the cushion-side pressure-receiving member  219 , and an open edge  267   a  at the upper end of the opening  267  is disposed at a position higher than the annular rotating member  230  when viewed from the side. 
     The one end portion  266   a  of the duct  266  is connected to the blower  265  so as to overlap the annular rotating member  230  in plan view at a position higher than the upper end of the annular rotating member  230 , and an intermediate part of the duct  266  is disposed so as to overlap the annular rotating member  230  when viewed from the side and is housed in the housing part  241 . 
     The operation of the electric motor  253 , which is a first item of electrical equipment, is controlled by a first ECU  270 , and the operation of the blower  265 , which is a second item of electrical equipment, is controlled by a second ECU  271 , both the first and second ECUs  270 ,  271  being present within the housing part  241  in the central part of the rotating member  230  in plan view, and at least parts of the ECUs  270 ,  271  (the entirety in this embodiment) being disposed at positions in which they overlap the rotating member  230  when viewed from the side. 
     The first ECU  270  and the second ECU  271  are disposed in an attitude in which they are inclined along the second taper portion  230   a  of the rotating member  230 , the first ECU  270  and the second ECU  271  being mounted on the mounting member  258 , which is mounted on the rotating member  230  in order to mount the actuator  250 , which includes the electric motor  253 . That is, the mounting member  258  has the pair of inclined plate portions  258   b , which are disposed within the housing part  241  in the central part of the rotating member  230  while being inclined along the second taper portion  230   a , and the first ECU  270  and the second ECU  271  are respectively mounted on the pair of inclined plate portions  258   b  disposed within the housing part  241  while being inclined along the second taper portion  230   a.    
     The first ECU  270  and the second ECU  271  are disposed beneath the cushion-side pressure-receiving member  219  while avoiding interference with the cushion-side pressure-receiving member  219  as in the case with the actuator  250 , and are mounted on the inclined plate portion  258   b . As shown in  FIG. 24 , the actuator  250  and the mounting member  258 , on which the first ECU  270  and the second ECU  271  are mounted, are present beneath the cushion-side pressure-receiving member  219  further forward than the lowest end  219   a  of the cushion-side pressure-receiving member  219  when viewed from the side, and the first ECU  270  and the second ECU  271  are therefore disposed at positions that avoid being immediately below the lowest end  219   a  of the cushion-side pressure-receiving member  219  when viewed from the side. 
     The operation of the embodiment is now explained. Since the circular housing part  241 , which opens at least upward, is formed in the central part of the rotating member  230  forming part of the rotation mechanism  214 , and the first ECU  270 , which controls the operation of the electric motor  253 , and the second ECU  271 , which controls the operation of the blower  265 , are present within the housing part  241  in plan view and are disposed at positions so that at least parts of the ECUs  270 ,  271  overlap the rotating member  230  when viewed from the side, it is possible, by suppressing upward protrusion of the first ECU  270  and the second ECU  271  from the rotating member  230 , to avoid any increase in the height of the seat cushion  211   a  due to disposition of the first and second ECUs  270 ,  271  and also to avoid any increase in the size of the vehicle seat device in a direction orthogonal to the rotational axis  2 C of the rotating member  230 . Moreover, in this embodiment, since the entireties of the first and second ECUs  270 ,  271  are disposed at positions in which they overlap the rotating member  230  when viewed from the side, it is possible to dispose the first ECU  270  and the second ECU  271  by suppressing upward protrusion of the first ECU  270  and the second ECU  271  from the rotating member  230 , thus suppressing more effectively any increase in the height of the seat cushion  211   a.    
     Furthermore, since the rotating member  230  is formed so as to have the second taper portion  230   a , which is formed so that the diameter increases in going upward, the cylindrical fourth side wall portion  230   b , which rises upward from the upper end part of the second taper portion  230   a  so as to form the housing part  241  in cooperation with the second taper portion  230   a , and the second collar portion  230   c , which protrudes outward from the fourth side wall portion  230   b , and the first and second ECUs  270 ,  271  are disposed in an attitude in which they are inclined along the second taper portion  230   a , it is possible to suppress more effectively upward protrusion of the first and second ECUs  270 ,  271  from the rotating member  230  and to suppress more effectively the height of the seat cushion  211   a.    
     Moreover, the electric motor  253  and the first and second ECUs  270 ,  271  are mounted on the rotating member  230  side, which is the one that has the greater length in the up-and-down direction among the base member  229  and the rotating member  230 , and it is thus possible to easily ensure there is space for disposition of the electric motor  253  and the first and second ECUs  270 ,  271  while suppressing any increase in the height of the vehicle seat device. 
     Furthermore, since the mounting member  258 , which is disposed further inside than the outer periphery  230   d  of the rotating member  230  in plan view, is mounted on the rotating member  230 , and the first and second ECUs  270 ,  271  are mounted on the mounting member  258 , it is possible to avoid any increase in the size of the vehicle seat device in a direction orthogonal to the rotational axis  2 C of the rotating member  230  due to disposition of the mounting member  258 , on which the first and second ECUs  270 ,  271  are mounted. 
     Moreover, since not only the first ECU  270  and the second ECU  271  but also the electric motor  253 , which exerts power for rotating the rotating member  230 , are mounted on the mounting member  258 , it is also possible to avoid any increase in the size of the vehicle seat device in a direction orthogonal to the rotational axis  2 C of the rotating member  230  due to disposition of the mounting member  258 , on which the electric motor  253  is mounted, thereby making it easy to connect the electric motor  253  and the first ECU  270 , which controls the operation of the electric motor  253 . 
     Furthermore, due to the mounting member  258  being mounted on the rotating member  230 , both the electric motor  253  and the first and second ECUs  270 ,  271  rotate with respect to the base member  229  when the rotating member  230  is rotating, and it is possible to compactly collect together the wiring for connecting the electric motor  253  and the first ECU  270 , which controls the operation of the electric motor  253 . 
     Moreover, since the mounting member  258  has the inclined plate portion  258   b , which is inclined along the second taper portion  230   a  of the rotating member  230  and is disposed within the housing part  241 , and the first and second ECUs  270 ,  271  are mounted on the inclined plate portion  258   b , it is possible to easily mount the first and second ECUs  270 ,  271  on the mounting member  258  in an inclined attitude in which they are inclined along the second taper portion  230   a  of the rotating member  230 , thus suppressing upward protrusion of the first and second ECUs  270 ,  271  from the rotating member  230 . 
     Furthermore, since the mounting member  258  is joined to the second collar portion  230   c  of the rotating member  230  further forward than the rotational axis  2 C of the rotating member  230 , and the first and second ECUs  270 ,  271  are mounted on the inclined plate portion  258   b  at positions in which they avoid interference with the cushion-side pressure-receiving member  219 , which is mounted on the seat cushion frame  216  so as to receive a load from above the seat cushion  211   a , it is possible to avoid any increase in the size of the vehicle seat device in the up-and-down direction. 
     Moreover, since the electric motor  250  and the first and second ECUs  270 ,  271  are disposed while avoiding being immediately beneath the lowest end  219   a  of the cushion-side pressure-receiving member  219  when viewed from the side, it is possible to more easily avoid interference of the electric motor  253  and the first and second ECUs  270 ,  271  with the cushion-side pressure-receiving member  219 . Furthermore, the electric motor  250  and the first and second ECUs  270 ,  271  are disposed beneath the cushion-side pressure-receiving member  219  further forward than the lowest end  219   a  of the cushion-side pressure-receiving member  219 , and it is possible to dispose the electric motor  250  and the first and second ECUs  270 ,  271  by utilizing effectively a space beneath the cushion-side pressure-receiving member  219 . 
     An embodiment of the present invention is explained above, but the present invention is not limited to the embodiment and may be modified in a variety of ways as long as the modifications do not depart from the subject matter thereof. 
     For example, in the above embodiment, the first ECU  270 , which controls the operation of the electric motor  253 , and the second ECU  271 , which controls the operation of the blower  265 , are explained, but the present invention may be widely applied to an ECU for controlling the operation of electrical equipment possessed by the vehicle seat device. 
     Furthermore, in the above embodiment, the first and second ECUs  270 ,  271  are mounted on the mounting member  258  mounted on the rotating member  230 , but an ECU may be mounted directly on the rotating member  230 . 
     Embodiments of Solution Means for Fourth Problem 
     Embodiments of the present invention are explained below by reference to the attached drawings. In the explanation below, ‘fore and aft’, ‘left and right’ and ‘up and down’ refer to directions viewed by a person seated on a seat in a normal attitude facing forward. 
     A first embodiment of the present invention is explained by reference to  FIG. 28  to  FIG. 33 . First, in  FIG. 28 , a seat main body  311  of a vehicle seat mounted on a vehicle includes a seat cushion  311   a  and a seat back  311   b  disposed above the seat cushion  311   a , and a headrest  311   c  that receives a head part of an occupant is disposed on an upper part of the seat back  311   b.    
     A seat frame  315  supporting the seat main body  311  includes a seat cushion frame  316  supporting the seat cushion  311   a  and a seat back frame  317  that supports the seat back  311   b  and is linked to a rear part of the seat cushion frame  316  via a support shaft  312 , the seat frame  315  being supported by a pair of left and right slide rails  313  provided on a vehicle floor face so as to extend in the vehicle fore-and-aft direction via a seat-rotating device  314  that can slide in the vehicle fore-and-aft direction. 
     The seat cushion frame  316  includes a pair of left and right side frames  316   a  that extend along the longitudinal direction of the slide rail  313  when the seat-rotating device  314  is in a state in which an occupant faces forward in the vehicle fore-and-aft direction, a pan frame  316   b  that provides a link between front end parts of the side frames  316   a , and a link pipe  316   c  that provides a link between rear parts of the pair of side frames  316   a.    
     The seat back frame  317  includes a pair of left and right seat back side frames  317   a  that extend in the up-and-down direction and have their lower end parts tiltably linked to a rear end part of the side frame  316   a  via the support shaft  312 , an upper frame  317   b  that provides a link between upper end parts of the seat back side frames  317   a , and a lower frame  317   c  that provides a link between lower end parts of the pair of seat back side frames  317   a , a pair of left and right pipe members  318  guiding up-and-down movement of the headrest  311   c  being fixed to the upper frame  317   b.    
     Referring in addition to  FIG. 29  and  FIG. 30 , a cushion-side pressure-receiving member  319  that receives a load from above the seat cushion  311   a  bridges between the pan frame  316   b  and the rear pipe  316   c  of the seat cushion frame  316 . The cushion-side pressure-receiving member  319  has a plurality (four in this embodiment) of seat springs  320  that are formed by curving a metal wire in a zig-zag so as to snake to the left and right, these seat springs  320  being disposed so that adjacent seat springs  320  have lateral symmetry and the adjacent seat springs  320  being linked to each other by means of a plurality of intermediate linking members  321  that are made of a resin and molded by insertion molding so as to be integral with the seat spring  320 . 
     Front end parts of the plurality of seat springs  320  are each engaged with latching parts  322  provided on the pan frame  316   b  of the seat frame  316 . Rear end parts of the mutually adjacent seat springs  320  are linked by means of a rear end part-linking member  323  that is made of a resin, molded by insertion molding so as to be integral with the seat spring  320 , and engaged with the support shaft  312  between the seat frame  315  and the seat back frame  317 , the rear end part-linking member  323  being formed so as to cover the support shaft  312 . 
     Referring again to  FIG. 28 , a back-side pressure-receiving member  324  formed from a resin, etc. so as to be elastically deformable is disposed between the pair of seat back side frames  317   a  of the seat back frame  317 , and the back-side pressure-receiving member  324  bridges between the left and right seat back side frames  317   a  via an upper link wire  325  and a lower link wire  326 . 
     The slide rail  313  is formed from a fixed rail  345  that extends in the vehicle fore-and-aft direction and a movable rail  346  that is slidably fitted to the fixed rail  345 , a front part of the fixed rail  345  is fixed to a vehicle floor face  347  via a front bracket  348 , and a rear part of the fixed rail  345  is fixed to the floor face  347  via a rear bracket  349 . Moreover, the front bracket  348  is formed so as to be higher than the rear bracket  349 , and the fixed rail  345 , that is, the slide rail  313 , extends in the vehicle fore-and-aft direction so as to be inclined so that its height decreases in going rearward in the vehicle fore-and-aft direction. 
     Referring in addition to  FIG. 31  and  FIG. 32 , the seat cushion frame  316  is placed on the seat-rotating device  314 , the seat-rotating device  314  including a base member  329  that can move along the slide rail  313 , an annular rotating member  330  that supports the seat cushion frame  316  and is rotatably supported on the base member  329 , and a cover member  331  that is fixed to the base member  329  while covering part of the rotating member  330  from above. 
     The base member  329  has an annular first bottom wall portion  329   a , a cylindrical first side wall portion  329   b  that rises upward from an outer peripheral part of the first bottom wall portion  329   a , and a first collar portion  329   c  that protrudes outward from an upper end part of the first side wall portion  329   b , the first collar portion  329   c  being formed into a rectangular shape. 
     The cover member  331  has an annular second bottom wall portion  331   a  that abuts against the first bottom wall portion  329   a  of the base member  329  from above, a cylindrical second side wall portion  331   b  that rises slightly upward from the outer periphery of the second bottom wall portion  331   a , a first taper portion  331   c  that is formed so as to have a larger diameter in going upward and is connectedly provided on an upper end part of the second side wall portion  331   b , an annular first flat wall portion  331   d  that protrudes sideways from an upper end part of the first taper portion  331   c , and a cylindrical third side wall portion  331   e  that rises upward from the outer periphery of the first flat wall portion  331   d , the second bottom wall portion  331   a  being joined to the first bottom wall portion  329   a  of the base member  329  by a plurality of rivets  332 . 
     The rotating member  330  has a second taper portion  330   a  that is disposed at a position opposing the first taper portion  331   c  of the cover member  331  from the outside and is formed so as to have a larger diameter in going upward, a cylindrical fourth side wall portion  330   b  that rises upward from an upper end part of the second taper portion  330   a  so as to oppose the third side wall portion  331   e  of the cover member  331  from the outside, and a second collar portion  330   c  that protrudes outward from the fourth side wall portion  330   b , the second collar portion  330   c  being formed into a rectangular shape. 
     A frame support member  333  extending in parallel with the side frame  316   a  of the seat cushion frame  316  is fastened to the second collar portion  330   c  of the rotating member  330  via pluralities of first bolts  334  and second nuts  335 . The side frame  316   a  is supported on the frame support member  333  so that it can be raised and lowered and cannot undergo relative rotation. 
     The rotating member  330  is rotatably supported on an annular rotation support part  336  of the base member  329  via a bearing  337 , the rotation support part  336  being formed from the first bottom wall portion  329   a  and the first side wall portion  329   b  of the base member  329  so that its cross-sectional shape is substantially L-shaped. 
     The bearing  337  is formed by retaining balls  339  at a plurality of locations in the peripheral direction of an annular retainer  338 , and an annular recess part  340  for the balls  339  to roll in is formed in the second taper portion  330   a  of the rotating member  330 . 
     A housing part  341  is formed in a central part of the rotating member  330  so as to open both upward and downward by means of the second taper portion  330   a  and the fourth side wall portion  330   b  of the rotating member  330 , the cover member  331  being housed and disposed within the housing part  341 . 
     The first collar portion  329   c  of the base member  329  is fastened to the movable rail  346  by means of pluralities of second bolts  342  and second nuts  343 . 
     The rotating member  330  is rotatingly driven by power exerted by an electric actuator for rotation  350  as a first electrical component mounted on at least one of the seat frame  315  and the rotating member  330  (in this embodiment the rotating member  330 ), and an input gear  352  provided on the base member  329  is meshed with an output gear  351  possessed by the electric actuator for rotation  350 . 
     The electric actuator for rotation  350  includes an electric motor  353  that has a rotational axis extending in the vehicle width direction, a gear box  355  that is linked to a case  354  of the electric motor  353 , and an output shaft  356  that protrudes from the gear box  355  with its rotational axis parallel to a rotational center  3 C of the rotating member  330 , the output gear  351  being provided on the output shaft  356 . A gear reduction mechanism (not illustrated) that transmits the rotational power of the electric motor  353  to the output shaft  356  by changing the rotational direction through 90 degrees and decreasing the speed is housed within the gear box  355 , this gear reduction mechanism including a worm gear so as to prevent the rotational power from the output shaft  356  side from being transmitted toward the electric motor  353  side. 
     The rotating member  330  is rotatingly driven through a range of 180 degrees, the input gear  352  is formed into an arc shape of substantially 180 degrees while having a gear portion  352   a  on the inner peripheral part, and the gear portion  352   a  is fixed to a lower face of an inner peripheral part of the first bottom wall portion  329   a  of the base member  329  so as to protrude radially inward from the inner periphery of the first bottom wall portion  329   a.    
     When fixing the input gear  352  to the base member  329 , some of the plurality of rivets  332 , which are used to join the second bottom wall portion  331   a  of the cover member  331  to the first bottom wall portion  329   a  of the base member  329 , are used for joining the second bottom wall portion  331   a  and the input gear  352  together to the first bottom wall portion  329   a  with the first bottom wall portion  329   a  sandwiched therebetween. 
     Mounted on the rotating member  330  is a mounting member  358  that is disposed further inside than an outer periphery  330   d  of the rotating member  330  in plan view, and mounted in the mounting member  358  is the actuator  350 , which includes the electric motor  353 . That is, the gear box  355  of the actuator  350  is mounted on an upper face of the mounting member  358 , and the output gear  351  is provided on the output shaft  356 , which extends through the mounting member  358 . 
     The mounting member  358  is disposed further forward than the rotational center  3 C of the rotating member  330 . The mounting member  358  extends so as to be orthogonal to the longitudinal direction of the slide rail  313  while having on opposite end parts joining plate portions  358   a  that are joined to an upper face of the third collar portion  330   c  of the rotating member  330 , and is formed so as to integrally have the pair of joining plate portions  358   a , a pair of left and right inclined plate portions  358   b  that are provided so as to be connected to the joining plate portion  358   a  via an upper end part while being inclined downward in going radially inward of the rotating member  330 , and a flat supporting plate portion  358   c  that provides a connection between lower ends of the inclined plate portions  358   b.    
     An electric wire  359  connected to the electric motor  353  of the electric actuator for rotation  350  is retained by an electric wire retaining member  360  that is fixedly disposed at the rotational center  3 C of the rotating member  330 . 
     Disposed between the first taper portion  331   c  of the cover member  331  and the second taper portion  330   a  of the rotating member  330  is an annular slider  361  that is in sliding contact with each of the taper portions  331   c ,  330   a . The slider  361  is employed in order to share the cover member  331  and the rotating member  330  with a vehicle seat device in which the rotating member  330  is rotated by applying manual power to the seat-rotating device  314  instead of electric power by means of the electric actuator for rotation  350 . In a vehicle seat device in which rotation by manual power is made possible, instead of the slider  360 , an annular member forming part of a mechanism that suppresses rattling of the rotating member  330  in a locked state in which rotation of the rotating member  330  is prevented is disposed between the first taper portion  331   c  and the second taper portion  330   a.    
     A blower  365 , which is a second electrical component, is mounted on at least one of the seat frame  315  and the rotating member  330 , in this embodiment the pan frame  316   b  of the seat cushion frame  316  of the seat frame  315 , and a duct  366  having one end portion  366   a  connected to the blower  365  has an opening  367  formed in the other end portion  366   b , which functions as a blower outlet. 
     As shown in  FIG. 30  the blower  365  is mounted on a lower part of the pan frame  316   b  via a blower support member  368 , the opening  367  being disposed on the radially inner side of the annular rotating member  330  and on the radially inner side of the cover member  331  in plan view. The opening  367  opens toward the seat cushion  311   a  side, and is disposed in plan view as is clearly shown in  FIG. 29  between a pair of seat springs  320  that are adjacent to each other among a plurality of seat springs  320  forming the cushion-side pressure-receiving member  319 . 
     The other end portion  366   b  of the duct  366  protrudes slightly so as to be higher than the cushion-side pressure-receiving member  319 , and an open edge  367   a  at the upper end of the opening  367  is disposed at a position higher than the annular rotating member  330  when viewed from the side. 
     An electric wire  369  connected to an electric motor (not illustrated) of the blower  365  is retained by the electric wire retaining member  360  fixedly disposed at the rotational center  3 C of the rotating member  330 . 
     Referring to  FIG. 28 , a link mechanism  371  is provided between the rotating member  330  of the seat-rotating device  314  and the seat frame  315 , the link mechanism  371  including a pair of left and right link members  372  having one end part pivotably linked to the link pipe  316   c  on the inside of the pair of side frames  316   a  of the seat cushion frame  316  of the seat frame  315 , and the other end parts of the link members  372  being pivotably linked to the frame support member  333  fixed to the rotating member  330  via a link pin  373 . That is, the side frame  316   a  of the seat cushion frame  316  of the seat frame  315  is supported on the frame support member  333  fixed to the rotating member  330  so that it can be raised and lowered. 
     Mounted on at least one of the seat frame  315  and the rotating member  330 , in this embodiment an outside face of one of the pair of side frames  316   a  of the seat frame  315 , is an electric actuator for raising/lowering  374 , which is a third electrical component, that can exert power for raising and lowering the seat frame  315 . 
     Among the pair of link members  372  of the link mechanism  371  provided between frame support member  333  fixed to the rotating member  330  and the seat frame  315 , the link member  372  on the one side frame  316   a  side has provided integrally therewith a sector gear (not illustrated) that can rotate around the axis of the link pin  373 , the electric actuator for raising/lowering  374  includes a drive gear (not illustrated) meshing with the sector gear, and the sector gear is pivoted around the axis of the link pin  373  together with the link member  372  by rotation of the drive gear, thus making it possible to raise and lower the seat frame  315 . 
     An electric wire  376  connected to an electric motor  375  of the electric actuator for raising/lowering  374  is guided to the inside of the seat-rotating device  314  via a through hole  377  formed in the one side frame  316   a  and is retained by the electric wire retaining member  360 . 
     An electric actuator for tilting  378  as a fourth electrical component is mounted on a lower part of the seat back frame  317  of the seat frame  315 . In this embodiment the electric actuator for tilting  378  is mounted on a lower part of one of the pair of seat back side frames  317   a  of the seat back frame  317 . 
     An electric wire  380  connected to an electric motor  379  of the electric actuator for tilting  378  is made to extend to the inside of the seat-rotating device  314  and is retained by the electric wire retaining member  360 . 
     An intermediate retaining member  381  is mounted on the seat back frame  317  or the rotating member  330  (in this embodiment the lower part of the one seat back side frame  317   a  of the seat back frame  317 ) in the vicinity of the support shaft  312  tiltably linking the seat back frame  317  to the seat cushion frame  316 , and the electric wire  380  is retained on the electric wire retaining member  360  via the electric wire retaining member  381 . 
     The electric wires  359 ,  369 ,  376 ,  380  individually connected to the electric actuator for rotation  350  as the first electrical component, the blower  365  as the second electrical component, the electric actuator for raising/lowering  374  as the third electrical component, and the electric actuator for tilting  378  as the fourth electrical component are collected together and retained by the single electric wire retaining member  360 . 
     Moreover, the electric wire retaining member  360  is disposed at a position in which it retains the electric wires  359 ,  369 ,  376 ,  380  beneath the cushion-side pressure-receiving member  319 , and is mounted directly on the cushion-side pressure-receiving member  319 . 
     The operation of the embodiment is now explained. Electrical components are mounted on at least one of the seat frame  315  supporting the seat main body  311  and the rotating member  330  supporting the seat frame  315 ; in this embodiment the blower  365 , the electric actuator for raising/lowering  374 , and the electric actuator for tilting  378  as electrical components are mounted on the seat frame  315 , and the electric actuator for rotation  350  as an electrical component is mounted on the rotating member  330 , the electric wire  359  connected to the electric actuator for rotation  350 , the electric wire  369  connected to the blower  365 , the electric wire  376  connected to the electric actuator for raising/lowering  374 , and the electric wire  380  connected to the electric actuator for tilting  378  being retained by the electric wire retaining member  360  fixedly disposed at the rotational center  3 C of the rotating member  330 , thus making it possible to avoid the occurrence of sagging or damage to the electric wires  359 ,  369 ,  376 ,  380  when the seat main body  311  is rotating. 
     Furthermore, since the electric wires  359 ,  369 ,  376 ,  380  individually connected to the electric actuator for rotation  350 , the blower  365 , the electric actuator for raising/lowering  374 , and the electric actuator for tilting  378 , which are the plurality of electrical components, are collected together and retained by the single electric wire retaining member  360 , it is possible to compactly and collectively carry out wiring of the plurality of electric wires  359 ,  369 ,  376 ,  380 . 
     Moreover, since the cushion-side pressure-receiving member  319 , which receives a load from above the seat cushion  311   a , is mounted on the cushion frame  316 , which forms part of the seat frame  315  and is supported on the rotating member  330 , and the electric wire retaining member  360  is disposed at a position in which it retains the electric wires  359 ,  369 ,  376 ,  380  beneath the cushion-side pressure-receiving member  319 , it is possible to suppress protrusion of the electric wire retaining member  360  toward the seat face for an occupant, thus enabling interference of the electric wire retaining member  360  with the occupant seated on the seat face to be avoided. 
     Furthermore, since the electric wire retaining member  360  is mounted directly on the cushion-side pressure-receiving member  319 , it is possible to efficiently dispose the electric wire retaining member  360  at the rotational center  3 C of the rotating member  330  while avoiding any increase in the number of components due to there being no need for newly providing a member for mounting the electric wire retaining member  360 . 
     Furthermore, since the seat frame  315  includes the seat cushion frame  316  supported on the rotating member  330 , and the seat back frame  317  tiltably mounted on the seat cushion frame  316  via the support shaft  312 , the electric actuator for tilting  378 , which is the electrical component, is mounted on the lower part of the seat back frame  317  so that the seat back frame  317  can be driven so as to tilt, and the electric wire  380  connected to the electric actuator for tilting  378  is retained by the electric wire retaining member  360  via the intermediate retaining member  381  mounted on the seat back frame  317  in the vicinity of the support shaft  312 , it is possible to prevent the occurrence of sagging or damage to the electric wire  380  between the electric wire retaining member  360  and the electric actuator for tilting  378  when the seat main body  311  is rotating or the seat back frame  317  is tilting. 
     A second embodiment of the present invention is explained by reference to  FIG. 33  and  FIG. 34 ; parts corresponding to those of the first embodiment are denoted by the same reference numerals and symbols and are only illustrated, detailed description thereof being omitted. 
     A retaining member-supporting part  383  is mounted on the base member  329  of the seat-rotating device  314 , and an electric wire retaining member  384  is mounted on the retaining member-supporting member  383 . 
     The retaining member-supporting member  383  is mounted on the base member  329  so as to pass through the rotational center  3 C of the rotating member  330 , and the electric wire retaining member  384  is mounted on the retaining member-supporting member  383  so as to retain, above the retaining member-supporting member  383 , the electric wires  359 ,  369 ,  376 ,  380  individually connected to the electric actuator for rotation  350 , the blower  365 , the electric actuator for raising/lowering  374 , and the electric actuator for tilting  378  as electrical components, while being disposed at the center of rotation  3 C. 
     In accordance with the second embodiment, as in the above first embodiment, it is possible to avoid the occurrence of sagging or damage to the electric wires  359 ,  369 ,  376 ,  380  when the seat main body  311  is rotating, and it is also possible to carry out wiring by compactly collecting together the plurality of electric wires  359 ,  369 ,  376 ,  380 . In addition thereto, when assembling the seat-rotating device  314 , the electric wire retaining member  384  can be easily assembled, the workability improves, and since the electric wire retaining member  384  retains the electric wires  359 ,  369 ,  376 ,  380  above the retaining member-supporting member  383 , it is possible to carry out wiring of the electric wires  359 ,  369 ,  376 ,  380  by compactly collecting them together within the seat-rotating device  314 . 
     As a third embodiment of the present invention as shown in  FIG. 35 , an electric wire retaining member  386  retaining the electric wires  359 ,  369 ,  376 ,  380  individually connected to the electric actuator for rotation  350 , the blower  365 , the electric actuator for raising/lowering  374 , and the electric actuator for tilting  378  as electrical components is mounted on a retaining member-supporting member  385  mounted on the base member  329  of the seat-rotating device  314 , and the electric wires  359 ,  369 ,  376 ,  380  are retained by the electric wire retaining member  386  so that they are present beneath the retaining member-supporting member  385  and at the rotational center  3 C of the rotating member  330 . 
     In accordance with the third embodiment, the same effects as those of the above second embodiment can be exerted and, furthermore, due to assembly of the seat-rotating device  314  being carried out in a state in which the seat-rotating device  314  is laid sideways it is possible to easily retain the electric wires  359 ,  369 ,  376 ,  380  on the electric wire retaining member  386 , thus improving the workability. 
     Embodiments of the present invention are explained above, but the present invention is not limited to the embodiments and may be modified in a variety of ways as long as the modifications do not depart from the subject matter thereof.