Patent Publication Number: US-9887481-B2

Title: Terminal, connector, and electrical connection apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority to Japanese Patent Application No. 2016-079086. The entire disclosure of Japanese Patent Application No. 2016-079086 is hereby incorporated herein by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a terminal for a connector that is used in a state of being inserted into a housing of the connector, and also relates to a connector that includes this terminal, and an electrical connection apparatus that includes this connector. 
     2. Description of Related Art 
     The terminal disclosed in JP 2000-353561A is known as an example of a terminal for a connector that is used in a state of being inserted into a housing of the connector. The terminal disclosed in JP 2000-353561A is configured as a female contact F that has a tubular (tube-like) portion  1  into which a male contact M is inserted, and the tubular portion  1  is formed by a bottom wall  2 , side walls ( 3 ,  3 ) that rise up from two ends of the bottom wall  2  in the width direction, an outer ceiling wall  4 , and an inner ceiling wall  5 . Note that the outer ceiling wall and the inner ceiling wall each extend from the ceiling edge of the corresponding side wall toward the ceiling edge of the opposing side wall, and are provided in a manner of overlapping each other. 
     As described in paragraph 0017 and shown in FIGS. 1 and 2 of JP 2000-353561A, a portion of the bottom wall  2  of the female contact F is cut and bent outward so as to serve as a rib  10 . In this configuration, when the female contact F is to be inserted into the housing chamber of a female housing FH, the rib  10  is fitted into a guiding groove that has been cut into the female housing FH, thus enabling the female contact F to be inserted into the housing chamber of the female housing FH. For this reason, if the tubular portion  1  of the female contact F is inserted into the housing chamber of the female housing FH in an orientation different from a predetermined insertion orientation, the rib  10  abuts against the female housing FH, thus restricting the tubular portion  1  from being inserted toward the back of the female housing FH. Accordingly, erroneous attachment of the female contact F to the female housing FH is prevented. 
     Also, the female contact F is configured such that when the female contact F is inserted into the housing chamber of the female housing FH, a housing lance is fitted into the hole formed by cutting and bending the rib  10 . Accordingly, the edge portion of this hole is configured to be able to engage with the housing lance of the female housing FH when the female contact F is inserted into the housing chamber of the female housing FH. Due to this hole provided in the female contact F engaging with the female housing FH, the female contact F that has been inserted into the female housing FH is prevented from coming out of the female housing FH. 
     SUMMARY OF THE INVENTION 
     In the female contact F disclosed in JP 2000-353561A, the rib  10  for preventing erroneous attachment of the female contact F to the female housing FH is formed by cutting a portion of the bottom wall  2  and bending it outward. Also, in the female contact F, the portion that engages with the female housing FH when the female contact F is inserted into the female housing FH in order to prevent the female contact F from coming out of and being withdrawn from the female housing FH is provided as the edge portion of the hole formed by cutting and bending the rib  10 . 
     According to the above configuration of the female contact F, the erroneous attachment prevention portion, which is the portion for preventing erroneous attachment of the female contact F to the female housing FH, and the withdrawal prevention portion, which is the portion for preventing the female contact F from coming out of and being withdrawn from the female housing FH, are provided adjacent to each other. For this reason, in the female contact F, the position of the erroneous attachment prevention portion and the position of the withdrawal prevention portion are constrained by the positions of one another. Accordingly it is desirable to be able to realize a terminal structure that can suppress the case in which the position of the erroneous attachment prevention portion and the position of the withdrawal prevention portion are constrained by the positions of one another. 
     Also, when realizing the aforementioned terminal structure, it is desirable to be able to use a simple structure to ensure appropriate operation of the erroneous attachment prevention portion when the erroneous attachment prevention portion of the terminal abuts against the housing of the connector due to the terminal being inserted into the housing in an orientation different from a predetermined insertion orientation. 
     In light of the above-described circumstances, an object of the present invention is to provide a terminal that can suppress the case in which the position of an erroneous attachment prevention portion, which is for preventing erroneous attachment of the terminal to a housing, and the position of a withdrawal prevention portion, which is for preventing the terminal from being withdrawn from the housing, are constrained by the positions of one another, and that enables realizing a simple structure for ensuring appropriate operation of the erroneous attachment prevention portion. Another object is to provide a connector that includes this terminal. A further object is to provide an electrical connection apparatus that includes this connector. 
     (1) A terminal according to one aspect of the present invention for achieving the above objects is a terminal for a connector that is used in a state of being inserted into a housing of the connector, the terminal including: a tubular (tube-like) wall portion having a first side wall portion, a bottom wall portion that is integrated with the first side wall portion, a second side wall portion that is integrated with the bottom wall portion, and an upper wall portion that is integrated with the second side wall portion; an abutting portion that is provided as a portion of an edge portion of the upper wall portion, and is configured to abut against an edge portion of the first side wall portion when the upper wall portion bends toward an inside of the tubular wall portion; a projection portion that protrudes from the upper wall portion in the shape of a protrusion or a projection, and that restricts insertion of the tubular wall portion toward a back of the housing by abutting against the housing when the tubular wall portion is inserted into the housing in an orientation different from a predetermined insertion orientation; and an engaging portion that is provided on the tubular wall portion and is configured to be able to engage with an engaged portion provided on an inner side of the housing when the tubular wall portion is inserted into the housing in the predetermined insertion orientation. Also, the engaging portion and the engaged portion are configured to be able to engage with each other by one of the engaging portion and the engaged portion abutting against the other one, elastically deforming, and then undergoing elastic recovery when the tubular wall portion is inserted into the housing in the predetermined insertion orientation, and the engaging portion is provided on the tubular wall portion at a position that is shifted from or separated from the projection portion in a longitudinal direction that is a direction in which the tubular wall portion extends in a tube shape. 
     In the terminal having the above configuration, when the tubular wall portion is inserted into the housing of the connector in an orientation different from the predetermined insertion orientation, the projection portion abuts against the housing  14 , thus restricting insertion of the tubular wall portion toward the back of the housing. Accordingly, erroneous attachment of the terminal to the housing is prevented. In other words, in the terminal having the above configuration, the projection portion is provided as an erroneous attachment prevention portion for preventing erroneous attachment of the terminal to the housing. 
     Also, the terminal having the above configuration is provided with the engaging portion that can engage with the engaged portion inside the housing when the terminal is inserted into the housing in the predetermined insertion orientation. The engaging portion and the engaged portion can engage with each other by one of them abutting against the other one, elastically deforming, and then undergoing elastic recovery. Due to the above-described engagement of the engaging portion of the terminal to the housing, when the terminal is inserted into the housing, the terminal is prevented from coming out of and being withdrawn from the housing. In other words, in the terminal having the above configuration, the engaging portion is provided as a withdrawal prevention portion for preventing the terminal from being withdrawn from the housing. 
     Furthermore, in the terminal having the above configuration, the engaging portion is provided at a position on the tubular wall portion that is shifted from or separated from the projection portion in the longitudinal direction. For this reason, according to the terminal having the above configuration, the projection portion serving as the erroneous attachment prevention portion and the engaging portion serving as the withdrawal prevention portion are provided in a state of being shifted or separated and independent in the longitudinal direction of the tubular wall portion. Thus, according to the terminal having the above configuration, it is possible to suppress the case where the projection portion serving as the erroneous attachment prevention portion and the engaging portion serving as the withdrawal prevention portion are constrained by the positions of one another. 
     Also, according to the terminal having the above configuration the tubular wall portion is constituted by integrally providing the first side wall portion, the bottom wall portion, the second side wall portion, and the upper wall portion in the stated order, and thus is constituted with a simple structure. Furthermore, in the terminal having the above configuration, the projection portion serving as the erroneous attachment prevention portion is constituted with a simple structure of projecting from the upper wall portion in the shape of a protrusion or a projection. Also, according to the terminal having the above configuration, a portion of the edge portion of the upper wall portion is constituted as an abutting portion that abuts against the edge portion of the first side wall portion when the upper wall portion bends toward the inside of the tubular wall portion. For this reason, even in the case where the terminal is inserted into the housing in an orientation different from the predetermined insertion orientation, the projection portion abuts against the housing, and the upper wall portion provided with the projection portion bends toward the inside of the tubular wall portion, the abutting portion abuts against the edge portion of the first side wall portion, thus preventing the upper wall portion from collapsing into the interior of the tubular wall portion. Accordingly, the projection portion is maintained in a state of abutting against the housing, and appropriate operation of the projection portion serving as the erroneous attachment prevention portion is ensured. Also, according to the terminal having the above configuration, the structure for ensuring appropriate operation of the projection portion serving as the erroneous attachment prevention portion is realized by a simple structure including the tubular wall portion that has a simple structure, the projection portion that has a simple structure, and the abutting portion that has a simple structure, is provided as a portion of the edge portion of the upper wall portion, and abuts against the edge portion of the first side wall portion. Thus, according to the terminal having the above configuration, it is possible to use a simple structure to ensure appropriate operation of the erroneous attachment prevention portion. 
     As described above, according to the above configuration, it is possible to provide a terminal that can suppress the case in which the position of an erroneous attachment prevention portion, which is for preventing erroneous attachment of the terminal to the housing, and the position of a withdrawal prevention portion, which is for preventing the terminal from being withdrawn from the housing, are constrained by the positions of one another, and that enables realizing a simple structure for ensuring appropriate operation of the erroneous attachment prevention portion. 
     (2) The projection portion may be provided on the tubular wall portion at a position on a leading end side relative to the engaging portion in an insertion direction that is a direction in which the tubular wall portion is inserted into the housing in parallel with the longitudinal direction, and the engaging portion may be provided on the tubular wall portion at a position that is shifted from or separated from the projection portion in a direction opposite to the insertion direction. 
     According to this configuration, the projection portion is provided on the leading end side in the direction of insertion of the terminal into the housing. For this reason, when the terminal is inserted into the housing in an orientation different from the predetermined insertion orientation, the projection portion abuts against the edge portion of the opening of the terminal insertion hole, which is the hole of the housing into which the terminal is inserted, and most of the portion of the terminal other than the portion on the leading end side of the tubular wall portion is exposed from the housing. Accordingly, the erroneous attachment state in which the terminal has been inserted into the housing in an orientation different from the predetermined insertion orientation is shown more clearly. Therefore, the operator who is performing the operation of inserting the terminal into the housing can quickly and easily see and recognize that erroneous attachment has occurred. 
     Furthermore, according to the above configuration, the engaging portion is provided on the tubular wall portion at a position that is shifted from or separated from the projection portion in the direction opposite to the direction of insertion of the terminal into the housing. For this reason, the position of the engaging portion serving as the withdrawal prevention portion is set to a position that is shifted or separated to the side opposite to the leading end side of the terminal, thus suppressing the case where this position is constrained by the position of the projection portion provided on the leading end side of the terminal. Also, due to the position of the engaging portion being set to a position that is shifted from or separated from the leading end side of the terminal, the engaging portion can be provided in a portion that has higher rigidity in the tubular wall portion. Accordingly, an engaging portion having higher rigidity can be constituted easily. 
     (3) The projection portion may have a bent portion that is integrated with a portion of the edge portion of the upper wall portion and is provided as a portion that extends while bending relative to the upper wall portion, and a projecting end portion that is provided as a portion projecting and extending from the bent portion in a cantilevered manner. 
     According to this configuration, the projection portion is constituted with a simple structure including the bent portion that is integrated with a portion of the edge portion of the upper wall portion, and the projecting end portion that extends from the bent portion in a cantilevered manner. Accordingly, the projection portion can be realized with an even simpler structure. 
     (4) The terminal may further include: electrical contact portions that are provided inside the tubular wall portion; and a pair of contact spring portions that are respectively provided as a portion of the first side wall portion and a portion of the second side wall portion, and that are provided as plate spring-shaped portions that extend in a cantilevered manner, and the electrical contact portions may be respectively provided on leading end sides of the pair of contact spring portions that extend in a cantilevered manner. 
     According to this configuration, the pair of contact spring portions respectively provided with the electrical contact portions are constituted as a portion of the first side wall portion and a portion of the second side wall portion. For this reason, a portion of the first side wall portion and a portion of the second side wall portion can be caused to function as the pair of contact spring portions, and the pair of contact spring portions can be realized with a simple structure. Furthermore, the pair of contact spring portions, which are provided as plate spring-shaped portions that extend in a cantilevered manner, and are provided with the electrical contact portions on the leading end side, are constituted as a portion of the first side wall portion or the second side wall portion. According to this configuration, it is possible to easily set a long length for the arm length from the base portions of the plate springs, which extend in a cantilevered manner, to the electrical contact portions on the leading end side. Also, the pair of contact spring portions are provided in the first side wall portion and the second side wall portion, and are not provided on the upper wall portion, thus making it possible to suppress the case of influencing the strength of the upper wall portion, which is the portion on which the projection portion is provided. 
     (5) The contact spring portions may each be arranged inward in a width direction of the tubular wall portion relative to an edge portion of the upper wall portion. 
     According to this configuration, the contact spring portions, which are provided as portions of the first and second side wall portions respectively, are arranged inward of the edge portions of the upper wall portion in the width direction of the tubular wall portion. For this reason, even if the terminal comes into contact with an outside object, it is possible to effectively suppress the case where the outside object comes into contact with and applies external force to the contact spring portions and deforms or breaks the contact spring portions. In particular, when multiple terminals are conveyed in a collective manner, it is possible to effectively suppress the case where another terminal comes into contact with and applies external force to the contact spring portions and deforms or breaks the contact spring portions. 
     (6) A plurality of abutting portions may be provided, and the plurality of abutting portions may be provided on the upper wall portion at positions that are separated from each other in the longitudinal direction. 
     According to this configuration, multiple abutting portions are provided as portions of the edge portion of the upper wall portion. Furthermore, the abutting portions are provided at positions that are separated from each other in the longitudinal direction of the tubular wall portion. For this reason, even in the case where the terminal is inserted into the housing in an orientation different from the predetermined insertion orientation, the projection portion abuts against the housing, and the upper wall portion provided with the projection portion bends toward the inside of the tubular wall portion, the abutting portions that are separated from each other abut against the edge portion of the first side wall portion. This therefore more reliably prevents the upper wall portion from collapsing into the interior of the tubular wall portion. Also, the projection portion can be more reliably maintained in a state of abutting against the housing, and appropriate operation of the projection portion serving as the erroneous attachment prevention portion can be more reliably ensured. 
     (7) A connector according to one aspect of the present invention for achieving the above objects is a connector that includes a plurality of the terminals according to any of the above-described aspects of the present invention, and further includes a housing configured to hold the plurality of terminals, wherein a plurality of the engaged portions are provided on an inner side of the housing, and the engaged portions are configured to be capable of being engaged with the engaging portions of the terminals. 
     According to this configuration, it is possible to achieve effects similar to those of the terminal according to the above-described aspect of the present invention. In other words, according to this configuration, it is possible to provide the connector that includes the terminal that can suppress the case in which the positions of the erroneous attachment prevention portion and the withdrawal prevention portion are constrained by the positions of one another, and that realizes a simple structure for ensuring appropriate operation of the erroneous attachment prevention portion. Also, according to the above configuration, in the housing of the connector as well, the position of the engaged portion that is engaged to the engaging portion of the terminal and the position of the portion that corresponds to the projection portion of the terminal can be set to independent positions. For this reason, in the housing of the connector as well, it is possible to suppress the case where the position of the engaged portion that is engaged to the engaging portion of the terminal and the position of the portion that corresponds to the projection portion of the terminal are constrained by the positions of one another. Furthermore, this makes it possible to improve the degree of freedom in the design of the connector. 
     (8) An electrical connection apparatus according to one aspect of the present invention for achieving the above objects is an electrical connection apparatus that includes the connector according to the above-described aspect of the present invention, and further includes a second connector capable of being mated and connected to a first connector configured as the connector, wherein the second connector includes: a plurality of second terminals capable of being electrically connected to a plurality of first terminals that are configured as the plurality of terminals in the first connector; and a second housing that is configured to hold the plurality of second terminals, and is configured to be mated to a first housing that is configured as the housing of the first connector. Also, the second housing is provided with a mating portion that has an opening into which the first housing is to be inserted, and that is mated to the first housing when the first housing is inserted through the opening, and a flat surface that is provided at a position that faces outside through the opening on an inner side of the mating portion, and that extends in a flat manner along a direction perpendicular to a direction in which the first housing is inserted through the opening. 
     According to this configuration, it is possible to achieve effects similar to those of the terminal according to the above-described aspect of the present invention. In other words, according to this configuration, it is possible to provide the electrical connection apparatus that includes the terminal that can suppress the case in which the positions of the erroneous attachment prevention portion and the withdrawal prevention portion are constrained by the positions of one another, and that realizes a simple structure for ensuring appropriate operation of the erroneous attachment prevention portion. Also, according to the above configuration, the flat surface faces the outside through the opening of the mating portion of the second housing on the inner side of the mating portion of the second housing of the second connector, and extends in a flat manner along the direction perpendicular to the direction in which the first housing of the first connector is inserted. For this reason, when the second connector is suctioned and conveyed by a conveying suction apparatus for mounting to the substrate, the second connector can be easily suctioned on the flat surface. Furthermore, the second connector can be held in a stable state by the conveying suction apparatus. Accordingly, the second connector can be easily mounted to the substrate. Also, as previously described, the first connector of the above-described electrical connection apparatus makes it possible to improve the degree of freedom in design. Therefore, according to the electrical connection apparatus having the above configuration, it is possible to improve the degree of freedom in the design of the first connector, and the second connector can be easily mounted to the substrate. 
     Note that the above and other objects, features, and advantages of the present invention will become apparent by reading the following description with the attached drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of an electrical connection apparatus according to an embodiment of the present invention, and shows a substrate and electrical wires as well. 
         FIG. 2  is a front view of the electrical connection apparatus shown in  FIG. 1 , and shows the substrate and electrical wires as well. 
         FIG. 3  is an exploded perspective view of the electrical connection apparatus shown in  FIG. 1 . 
         FIG. 4  is a diagram showing a cross-section taken along line A-A in  FIG. 2  and viewed in the direction indicated by arrows. 
         FIG. 5  is a diagram showing a partial cross-section of the electrical connection apparatus shown in  FIG. 1 , this partial cross-section being taken along line B-B in  FIG. 4  and viewed in the direction indicated by arrows. 
         FIG. 6  is a perspective view of a first connector (connector according to an embodiment of the present invention) of the electrical connection apparatus shown in  FIG. 1 , and shows electrical wires as well. 
         FIG. 7  is a bottom view of the first connector shown in  FIG. 6 . 
         FIG. 8  is a perspective view of a first housing (housing according to an embodiment of the present invention) of the first connector shown in  FIG. 6 . 
         FIG. 9  is a plan view of the first housing shown in  FIG. 8 . 
         FIG. 10  is a perspective view of a second connector of the electrical connection apparatus shown in  FIG. 1 . 
         FIG. 11  is a plan view of the second connector shown in  FIG. 10 . 
         FIG. 12  is a perspective view of the second connector shown in  FIG. 10 , and shows the substrate as well. 
         FIG. 13  is a perspective view of a first terminal (terminal according to an embodiment of the present invention) of the first connector of the electrical connection apparatus shown in  FIG. 1 . 
         FIG. 14  is a perspective view of the first terminal shown in  FIG. 13 , from an angle that is different from the angle in  FIG. 13 . 
         FIG. 15  is a perspective view of the first terminal shown in  FIG. 13 , from an angle that is different from the angles in  FIGS. 13 and 14 . 
         FIG. 16  is a front view of the first terminal shown in  FIG. 13 . 
         FIG. 17  is a side view of the first terminal shown in  FIG. 13 . 
         FIG. 18  is a plan view of the first terminal shown in  FIG. 13 , in which the side surface shown in  FIG. 17  is shown as the front surface side. 
         FIG. 19  is a diagram showing a cross-section taken along line C-C in  FIG. 17  and viewed in the direction indicated by arrows. 
         FIG. 20  is a diagram showing a cross-section taken along line D-D in  FIG. 17  and viewed in the direction indicated by arrows. 
         FIG. 21  is a diagram showing a cross-section taken along line E-E in  FIG. 18  and viewed in the direction indicated by arrows. 
         FIG. 22  is a front view of a terminal according to a first variation. 
         FIG. 23  is a front view of a terminal according to a second variation. 
         FIG. 24  is a side view of a terminal according to a third variation, and is a partial cutaway view of the terminal according to the third variation. 
         FIG. 25  is a perspective view of a terminal according to a fourth variation, and is a partial cutaway view of the terminal according to the fourth variation. 
         FIG. 26  is a perspective view of a terminal according to a fifth variation, and is a partial cutaway view of the terminal according to the fifth variation. 
         FIG. 27  is a perspective view of a terminal according to a sixth variation, and is a partial cutaway view of the terminal according to the sixth variation. 
         FIG. 28  is a perspective view of a terminal according to a seventh variation, and is a partial cutaway view of the terminal according to the seventh variation. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Hereinafter, modes for carrying out the present invention will be described with reference to the drawings. Note that the present invention is broadly applicable to a terminal for a connector that is used in a state of being inserted into a housing of the connector, and also to a connector that includes this terminal, and an electrical connection apparatus that includes this connector. 
     Electrical Connection Apparatus 
       FIG. 1  is a perspective view of an electrical connection apparatus  1  according to an embodiment of the present invention, and shows a substrate  100  and electrical wires  101  as well.  FIG. 2  is a front view of the electrical connection apparatus  1  shown in  FIG. 1 , and shows the substrate  100  and the electrical wires  101  as well.  FIG. 3  is an exploded perspective view of the electrical connection apparatus  1 .  FIG. 4  is a diagram showing a cross-section taken along line A-A in  FIG. 2  and viewed in the direction indicated by arrows.  FIG. 5  is a diagram showing a partial cross-section of the electrical connection apparatus  1 , this partial cross-section being taken along line B-B in  FIG. 4  and viewed in the direction indicated by arrows. 
     The electrical connection apparatus  1  shown in  FIGS. 1 to 5  is provided as an apparatus for electrically connecting the substrate  100  and multiple electrical wires  101 . The electrical connection apparatus  1  includes a first connector  11  and a second connector  12 . Note that only a partial cutout of the substrate  100  is shown in  FIGS. 1, 2, 4, and 5 . Also, only partial cutouts of the electrical wires  101  are shown in  FIGS. 1  to  5 . 
     The first connector  11  of the electrical connection apparatus  1  is configured to be electrically connected to multiple electrical wires  101 , and to be electrically connected to the second connector  12  of the electrical connection apparatus  1 . Also, the second connector  12  is configured to be electrically connected to the substrate  100 , and to be electrically connected to the first connector  11 . When the first connector  11 , which is electrically connected to multiple electrical wires  101 , is mated with and connected to the second connector  12 , which is electrically connected to the substrate  100 , the first connector  11  and the partner second connector  12  become mechanically and electrically connected to each other. Also, due to the first connector  11  and the second connector  12  being electrically connected, the electrical wires  101  and the substrate  100  become electrically connected to each other. 
     First Connector 
       FIG. 6  is a perspective view of the first connector  11  of the electrical connection apparatus  1 , and shows the electrical wires  101  as well.  FIG. 7  is a bottom view of the first connector. The first connector  11  of the electrical connection apparatus  1  constitutes a connector according to an embodiment of the present invention. Note that the first connector  11  will also be called the connector  11  in the following description. 
     The first connector  11  shown in  FIGS. 1 to 7  includes multiple first terminals  13 , a first housing  14 , and a retainer  15 . The first terminals  13  each constitute a terminal according to an embodiment of the present invention. Also, the first housing  14  constitutes the housing of the connector  11  (first connector  11 ) according to an embodiment of the present invention. Note that the first terminals  13  will also be called the terminals  13  in the following description. Also, the first housing  14  will also be called the housing  14 . 
     The first terminals  13  of the first connector  11  shown in  FIGS. 3 to 5 and 7  are configured to be mechanically and electrically connected to the electrical wires  101 . Note that  FIG. 4  shows a partial cutaway cross-section of first terminals  13 . The first terminals  13  are each formed by a metal material that has electrical conductivity. The first terminals  13  are crimped to end portions of respective electrical wires  101  so as to be attached and fixed thereto, thus being mechanically and electrically connected to the electrical wires  101 . The first terminals  13  with the electrical wires  101  connected thereto are inserted into the first housing  14 . When inserted into the first housing  14 , the first terminals  13  engage with inner portions of the first housing  14  and are held in the first housing  14 . Note that details of the configuration of the first terminals  13  will be described later. 
       FIG. 8  is a perspective view of the first housing  14  of the first connector  11 .  FIG. 9  is a plan view of the first housing  14 . The first housing  14  shown in  FIGS. 1 to 9  is configured to hold multiple first terminals  13 . Note that  FIGS. 8 and 9  show the first housing  14  in the state of not holding first terminals  13 . 
     The first housing  14  is formed by a resin material that has insulating properties. The first housing  14  is provided with multiple terminal insertion holes  16 , multiple engaged portions  17 , multiple insertion orientation restriction grooves  18 , a retaining portion  19 , retainer engaging portions  20 , and the like. 
     The terminal insertion holes  16  are provided as holes that receive insertion of and hold the first terminals  13 . The terminal insertion holes  16  are provided as holes that have an approximately quadrangular cross-sectional shape, for example. The terminal insertion holes  16  of the first housing  14  are provided side-by-side in two rows along the width direction of the first housing  14 . The width direction of the first housing  14  is indicated by a double-headed arrow W in  FIGS. 7 and 9 . Note that the width direction of the first housing  14  is the same direction as the width direction of the first connector  11 . 
     Also, the terminal insertion holes  16  are each provided as a hole that is defined by a row partition wall  21  and terminal partition walls  22  inside the first housing  14 . The row partition wall  21  is provided as a partition wall that extends along the width direction of the first housing  14  inside the first housing  14 . The rows of terminal insertion holes  16 , which are provided side-by-side in two rows along the width direction of the first housing  14 , are divided by the row partition wall  21 . The terminal partition walls  22  are provided on both sides of the row partition wall  21 . The terminal partition walls  22  are each provided in a manner of extending perpendicularly to the row partition wall  21 . The region between adjacent terminal partition walls  22  is configured as the region in which a terminal insertion hole  16  is defined. 
     As shown in  FIG. 4 , the engaged portions  17  are provided inside the first housing  14 . The engaged portions  17  are provided side-by-side on both sides of the row partition wall  21  inside the first housing  14 . The engaged portions  17  are provided at positions that respectively correspond to the terminal insertion holes  16 . Also, the engaged portions  17  are each configured such that later-described engaging portions  37  of the first terminals  13  can be engaged thereto. 
     The engaged portions  17  provided on the row partition wall  21  are provided in correspondence with the terminal insertion holes  16  inside the first housing  14 , and are furthermore provided as portions that extend in a cantilevered manner so as to be capable of elastically deforming by bending. The engaged portions  17  are each provided with a recession portion  17   a  that is recessed in a step-like shape in the leading end portion that extends from the row partition wall  21  in a cantilevered manner. The recession portions  17   a  of the engaged portions  17  are provided so as to be capable of being engaged with the engaging portions  37  of the first terminals  13 . 
     As shown in  FIGS. 8 and 9 , multiple insertion orientation restriction grooves  18  are provided in the first housing  14 . The insertion orientation restriction grooves  18  are provided in correspondence with the terminal insertion holes  16 . Also, the insertion orientation restriction grooves  18  are each provided as a groove into which a later-described projection portion  36  of a first terminal  13  fits. When a first terminal  13  is inserted into a terminal insertion hole  16  in an orientation in which the protrusion portion  36  of the first terminal  13  fits into the insertion orientation restriction groove  18 , the insertion of the first terminal  13  into the terminal insertion hole  16  is allowed. However, when a first terminal  13  is inserted into a terminal insertion hole  16  in an orientation different from the orientation in which the protrusion portion  36  of the first terminal  13  fits into the insertion orientation restriction groove  18 , the insertion of the first terminal  13  into the terminal insertion hole  16  is restricted. 
     The end portions of the insertion orientation restriction grooves  18  on one side are provided at positions that are exposed to the outside through the openings of the terminal insertion holes  16 . Also, the insertion orientation restriction grooves  18  are each provided as a groove that extends along a wall surface that defines the terminal insertion hole  16 , and provided as a groove that extends along the direction in which the hole shape of the terminal insertion hole  16  extends. The insertion orientation restriction grooves  18  are arranged at positions that are eccentric to one side in the width direction of the first housing  14  in a cross-section of the approximately quadrangular terminal insertion holes  16 . Note that in the present embodiment, the insertion orientation restriction grooves  18  are each provided at a position that corresponds to one of the four corner portions of the cross-section of the approximately quadrangular terminal insertion hole  16 . 
     The retaining portion  19  is provided as a portion that engages with the second connector  12  when the first connector  11  is mated with and connected to the second connector  12 , and is provided as a mechanism for preventing the first connector  11  from coming out of and falling out of the second connector  12 . The retaining portion  19  includes a pair of arms ( 19   a ,  19   a ) and a pair of protrusion portions ( 19   b ,  19   b ). 
     The pair of arms ( 19   a ,  19   a ) are provided so as to extend in a cantilevered manner substantially parallel to each other from one outer wall surface of the first housing  14 , and are capable of elastically deforming by bending. Also, the pair of arms ( 19   a ,  19   a ) are each provided so as to extend in a cantilevered manner along the direction opposite to the direction in which the first connector  11  is mated to the second connector  12 . Furthermore, leading end portions of the pair of arms ( 19   a ,  19   a ) that extend in a cantilevered manner are integrated with each other. 
     The pair of protrusion portions ( 19   b ,  19   b ) are provided on the leading end portions of the pair of arms ( 19   a ,  19   a ) that extend in a cantilevered manner. Specifically, the pair of protrusion portions ( 19   b ,  19   b ) are provided on the leading end portions of the pair of arms ( 19   a ,  19   a ) that are integrated with each other. Furthermore, the pair of protrusion portions ( 19   b ,  19   b ) are provided as portions that convexly rise toward the outside of the first housing  14  on the integrated leading end portions of the pair of arms ( 19   a ,  19   a ). 
     When the first connector  11  is to be mated and connected to the second connector  12 , the first housing  14  of the first connector  11  is inserted into and mated to the later-described second housing  24  of the second connector  12 . When the first housing  14  is inserted into the second housing  24 , the pair of protrusion portions ( 19   b ,  19   b ) come into contact with a wall portion of the second housing  24 , and the pair of arms ( 19   a ,  19   a ) temporarily bend toward the inside of the first housing  14 . Thereafter, the pair of arms ( 19   a ,  19   a ) undergo elastic recovery toward the outside of the first housing  14 , and the pair of protrusion portions ( 19   b ,  19   b ) are respectively fitted into and engage with a later-described pair of engagement holes ( 30 ,  30 ) that are provided in a wall portion of the second housing  24 . Accordingly the first connector  11  that is mated and connected to the second connector  12  is prevented from coming out of and falling out of the second connector  12 . 
     The retainer engaging portions  20  are provided as portions for engagement with the retainer  15  attached to the first housing  14 . A pair of retainer engaging portions  20  are provided, one on each side in the width direction of the first housing  14 . The retainer engaging portions  20  are each provided as a portion that convexly rises toward the outside of the first housing  14 . When the retainer  15  is engaged with the first housing  14  by the retainer engaging portions  20 , the retainer  15  is fixed to and held by the first housing  14 . 
     The retainer  15  shown in  FIGS. 1 to 7  is configured so as to be attached to the first housing  14  in a state where the first terminals  13  are held in the first housing  14 . Also, the retainer  15  is provided as an element for more reliably preventing the first terminals  13  from coming out of the first housing  14 . Note that the first terminals  13  are each prevented from coming out of the first housing  14  by the later-described engaging portions  37  engaging with the engaged portions  17  inside the first housing  14 . By attaching the retainer  15  to the first housing  14  in the state where the first terminals  13  are held in the first housing  14 , the first terminals  13  are more reliably prevented from coming out of the first housing  14 . 
     The retainer  15  includes a retainer main body portion  15   a  that extends along the width direction of the first connector  11 , and a pair of housing engaging portions ( 15   b ,  15   b ) that engage with the pair of retainer engaging portions ( 20 ,  20 ) of the first housing  14 . 
     The pair of housing engaging portions ( 15   b ,  15   b ) are provided on respective sides in the width direction of the retainer main body portion  15   a . The housing engaging portions  15   b  are each formed as an annular portion provided with a hole into which a retainer engaging portion  20  fits. When the retainer  15  is attached to the first housing  14 , the housing engaging portions  15   b  temporarily bend due to coming into contact with the retainer engaging portions  20  and elastically deforming. Thereafter, the housing engaging portions  15   b  undergo elastic recovery, and the retainer engaging portions  20  are fitted into and engaged with the holes of the housing engaging portions  15   b . Accordingly, the retainer  15  is attached to the first housing  14 . 
     Also, the retainer main body portion  15   a  is provided with grooves that respectively correspond to the electrical wires  101  connected to the first terminals  13 . In the state where the retainer  15  is attached to the first housing  14 , the electrical wires  101  connected to the first terminals  13  are arranged in a state of extending in a straight manner along the inside of the grooves of the retainer main body portion  15   a . Also, the end portions on one side of the grooves provided in the retainer main body portion  15   a  are arranged so as to be capable of abutting against the end portions of the first terminals  13  connected to the electrical wires  101 . If a first terminal  13  becomes displaced in the direction of removal from the first housing  14 , the end portion of that first terminal  13  abuts against the end portion of the corresponding groove of the retainer main body portion  15   a . Accordingly, the first terminals  13  are more reliably prevented from coming out of the first housing  14 . 
     Second Connector 
       FIG. 10  is a perspective view of the second connector  12  of the electrical connection apparatus  1 .  FIG. 11  is a plan view of the second connector  12 .  FIG. 12  is a perspective view of the second connector  12 , and shows the substrate  100  as well. 
     The second connector  12  shown in  FIGS. 1 to 5 and 10 to 12  is mated and connected to the first connector  11  constituted as the connector  11  according to an embodiment of the present invention. The second connector  12  is connected to the first connector  11  in the state of being connected to the substrate  100 . Also, the second connector  12  includes multiple second terminals  23  and a second housing  24 . 
     The second terminals  23  of the second connector  12  shown in  FIGS. 1 to 5 and 10 to 12  are held in the second housing  24  of the second connector  12 . Also, the second terminals  23  are configured to be mechanically and electrically connected to the first terminals  13  of the first connector  11 . More specifically the second terminals  23  are mechanically and electrically connected to the first terminals  13  due to being mated to the first terminals  13  when the first connector  11  is mated and connected to the second connector  12 . 
     Also, the second terminals  23  are each formed by a metal material that is electrically conductive, and are mechanically and electrically connected to the substrate  100 . More specifically, the second terminals  23  are soldered to the surface of the substrate  100  so as to be mechanically fixed to the substrate  100  and also electrically connected to a conductive circuit pattern of the substrate  100 . 
     Also, the second terminals  23  of the second housing  24  are arranged side-by-side in two rows along the width direction of the second housing  24 . The width direction of the second housing  24  is indicated by a double-headed arrow W in  FIG. 11 . Note that the width direction of the second housing  24  is the same direction as the width direction of the second connector  12 . Also, in the state where the second connector  12  and the first connector  11  are mated and connected to each other, the width direction of the second connector  12  is the same direction as the width direction of the first connector  11 . 
     The second terminals  23  are each provided with one portion that is bent approximately 90 degrees, and has an overall shape of extending substantially in an “L” shape. The second terminals  23  are each provided with a terminal connection portion  25 , a substrate connection portion  26 , and a press-fit portion  27 . 
     The terminal connection portions  25  are each provided as the portion on one end side in the longitudinal direction of the second terminal  23  that extends substantially in an “L” shape. Also, the terminal connection portions  25  are configured to be mechanically and electrically connected to the first terminals  13  of the first connector  11  by being mated to the first terminals  13 . Note that the terminal connection portions  25  are arranged inside the second housing  24  of the second connector  12  in a manner of protruding and extending in a cantilevered manner along a direction parallel to the direction in which the first connector  11  and the second connector  12  are mated to each other. 
     The substrate connection portions  26  are each provided as the portion on the other end side in the longitudinal direction of the second terminal  23  that extends substantially in an “L” shape. In other words, the substrate connection portions  26  are each provided as the portion on the side opposite to the terminal connection portion  25  side in the longitudinal direction of the second terminal  23  that extends substantially in an “L” shape. Also, the substrate connection portions  26  are configured to be mechanically and electrically connected to the substrate  100  by being soldered to the substrate  100 . Note that the substrate connection portions  26  are arranged such that the leading end portions thereof protrude and extend toward the outside of the second housing  24  along a direction substantially perpendicular to the direction in which the first connector  11  and the second connector  12  are mated to each other. 
     The press-fit portions  27  are each provided as a portion that is engaged with and fixed to the second housing  24  by being press-fitted into a terminal press-fit hole  29  of the second housing  24  when the second terminal  23  is press-fitted into and held in the second housing  24  (see  FIGS. 4 and 5 ). More specifically, the press-fit portions  27  are each provided as an intermediate portion in the longitudinal direction of the second terminal  23  that extends substantially in an “L” shape, and provided between the terminal connection portion  25  and the portion of the second terminal  23  that is bent approximately 90 degrees. Also, the press-fit portions  27  are each provided as a portion that is wider than the terminal connection portion  25  in the width direction that is perpendicular to the longitudinal direction of the second terminal  23 . In other words, the press-fit portions  27  are each provided as a wide-width portion that has a wider width in a portion in the longitudinal direction of the second terminal  23  that extends substantially in an “L” shape. 
     When the second terminals  23  are press-fitted into and held in the second housing  24 , the second terminals  23  are inserted into the terminal press-fit holes  29  of the second housing  24  from the terminal connection portion  25  side. The terminal connection portions  25  then pass through the terminal press-fit holes  29  and are placed inside the second housing  24 , and the press-fit portions  27  are press-fitted into the terminal press-fit holes  29  in this state. Accordingly, the press-fit portions  27  are engaged with and fixed to the second housing  24  by press-fitting, and the second terminals  23  are held in the second housing  24 . 
     The second housing  24  of the second connector  12  shown in  FIGS. 1 to 5 and 10 to 12  is configured to hold multiple second terminals  23 . Also, the second housing  24  is configured to be mated with the first housing  14  of the first connector  11 . 
     The second housing  24  is formed by a resin material that has insulating properties, and includes a rectangular tube-shaped portion that has an approximately rectangular cross-sectional shape. The second housing  24  is also provided with a mating portion  28 , multiple terminal press-fit holes  29 , a pair of engagement holes ( 30 ,  30 ), a flat surface  31 , and the like. 
     The mating portion  28  has an approximately rectangular opening  28   a  into which the first housing  14  of the first connector  11  is inserted. Also, the mating portion  28  is provided as the portion to which the first housing  14  is mated when inserted through the opening  28   a . The terminal connection portions  25  of multiple second terminals  23  are arranged on the inner side of the mating portion  28  that faces the outside via the opening  28   a  of the mating portion  28 . 
     The terminal press-fit holes  29  are provided as holes into which the press-fit portions  27  of the second terminals  23  are press-fitted and held. Also, the terminal press-fit holes  29  are provided as through-holes that have a cross-sectional shape that corresponds to the cross-sectional shape of the press-fit portions  27  of the second terminals  23 . The terminal press-fit holes  29  are each formed so as to pass through a wall portion  32  of an end portion of the second housing  24  that is on the side opposite to the opening  28   a  side of the mating portion  28 . Also, the terminal press-fit holes  29  are provided side-by-side in two rows along the width direction of the second housing  24  in the wall portion  32  of the second housing  24  on the side opposite to the opening  28   a  side. 
     The pair of engagement holes ( 30 ,  30 ) are provided as through-holes that the pair of protrusion portions ( 19   b ,  19   b ) of the retaining portion  19  of the first housing  14  are fitted into and engage with when the first housing  14  is inserted into and mated to the second housing  24 . The pair of engagement holes ( 30 ,  30 ) are provided side-by-side in the second housing  24  in the vicinity of an edge portion, which is on the opening  28   a  side, of a wall portion that constitutes a portion of the mating portion  28 . Also, the pair of engagement holes ( 30 ,  30 ) are provided in the second housing  24  at positions that correspond to the pair of protrusion portions ( 19   b ,  19   b ) when the first housing  14  has been mated to the second housing  24 . 
     When the first housing  14  is to be mated to the second housing  24 , the pair of arms ( 19   a ,  19   a ) temporarily bend inside the second housing  24  and then undergo elastic recovery, and thus the pair of protrusion portions ( 19   b ,  19   b ) are respectively fitted into the pair of engagement holes ( 30 ,  30 ). Also, the protrusion portions  19   b  are fitted into the engagement holes  30  in a state of being capable of engaging with the edge portions of the engagement holes  30  on the opening  28   a  side. Accordingly, even if external force in the direction opposite to the direction of mating to the second housing  24  acts on the first housing  14  that is mated to the second housing  24 , the pair of protrusion portions ( 19   b ,  19   b ) and the pair of engagement holes ( 30 ,  30 ) engage with each other, thus preventing the first housing  14  from coming out of and falling out of the second housing  24 . In other words, the first connector  11  that is mated and connected to the second connector  12  is prevented from coming out of and falling out of the second connector  12 . 
     The flat surface  31  is configured as a flat surface provided on the inner side of the second housing  24 . More specifically, the flat surface  31  is provided at a position that faces the outside through the opening  28   a  on the inner side of the mating portion  28 , and is configured as a surface that extends in a flat manner along the direction perpendicular to the direction in which the first housing  14  is inserted through the opening  28   a  (see  FIGS. 4 and 11 ). Also, the flat surface  31  is configured as a surface in the second housing  24  that extends in a flat manner and is elongated in the width direction of the second housing  24 . Furthermore, the flat surface  31  is arranged between the two rows of second terminals  23  that are arranged side-by-side along the width direction of the second housing  24 . For this reason, the flat surface  31  is arranged as a wide and flat expansion in the central region on the inner side of the mating portion  28 . 
     When the second connector  12  is suctioned and conveyed by a conveying suction apparatus (not shown) for mounting to the substrate  100 , the second connector  12  is suctioned by the suction apparatus on the flat surface  31  of the second housing  24 . The second connector  12 , which is suctioned by the suction apparatus on the flat surface  31 , is conveyed to a predetermined position on the substrate  100  at which solder paste has been applied, and is then placed on that predetermined position. When the second connector  12  is placed on the predetermined position of the substrate  100 , the suctioning of the flat surface  31  by the suction apparatus is stopped. Thereafter, the solder is heated, thus soldering and fixing the second connector  12  to the substrate  100 . 
     First Terminal 
     Next, the first terminals  13  of the first connector  11  of the electrical connection apparatus  1  will be described in further detail.  FIG. 13  is a perspective view of a first terminal  13 .  FIG. 14  is a perspective view of the first terminal  13  from an angle that is different from the angle in  FIG. 13 .  FIG. 15  is a perspective view of the first terminal  13  from an angle that is different from the angles in  FIGS. 13 and 14 . FIG.  16  is a front view of the first terminal  13 .  FIG. 17  is a side view of the first terminal  13 .  FIG. 18  is a plan view of the first terminal  13 , in which the side surface shown in  FIG. 17  is shown as the front surface side. 
     The first terminal  13  shown in  FIGS. 3 to 5, 7, and 13 to 18  constitutes the terminal  13  according to an embodiment of the present invention, and is configured as a terminal  13  of the connector  11  (first connector  11 ) in an embodiment of the present invention. Note that in the following description, the first terminal  13  will also be called the terminal  13 , the first connector  11  will also be called the connector  11 , and the first housing  14  will also be called the housing  14 , as previously described. 
     The terminal  13  is configured as a terminal for the connector  11  that is used in the state of being inserted into the housing  14  of the connector  11 . The terminal  13  includes a tubular (tube-like) wall portion  33 , abutting portions ( 34 ,  35 ), a projection portion  36 , an engaging portion  37 , electrical contact portions ( 38 ,  39 ), contact spring portions ( 40 ,  41 ), an electrical wire crimping portion  42 , a conductor crimping portion  43 , and the like. 
     As shown in  FIGS. 4 and 13 to 18 , the tubular wall portion  33  is provided as a rectangular tube-shaped portion of the terminal  13 . The tubular wall portion  33  has a longitudinal direction, which is the direction in which the tube shape extends. The longitudinal direction of the tubular wall portion  33  is indicated by a dashed double-dotted line double-headed arrow L in  FIG. 17 . Note that the longitudinal direction of the tubular wall portion  33  is the same direction as the longitudinal direction of the terminal  13 . 
     Also, the tubular wall portion  33  includes a first side wall portion  44 , a bottom wall portion  45  that is integrated with the first side wall portion  44 , a second side wall portion  46  that is integrated with the bottom wall portion  45 , and an upper wall portion  47  that is integrated with the second side wall portion  46 . In other words, the tubular wall portion  33  is provided as a rectangular tube-shaped portion of the terminal  13  that has four wall portions, namely the first side wall portion  44 , the bottom wall portion  45 , the second side wall portion  46 , and the upper wall portion  47 . Note that the first side wall portion  44  and the upper wall portion  47  are not integrated with each other, and the first side wall portion  44  and the upper wall portion  47  are provided such that edge portions thereof can partially abut against each other. 
     When the terminal  13  is inserted into the housing  14  (first housing  14 ), the tubular wall portion  33  is inserted into a terminal insertion hole  16  of the housing  14  in a direction parallel to the longitudinal direction of the tubular wall portion  33 . Also, the tubular wall portion  33  has a terminal insertion opening  33   a  on the leading end side in the insertion direction, which is the direction in which the tubular wall portion  33  is inserted into the housing  14  in parallel with the longitudinal direction of the tubular wall portion  33 . 
     When the connector  11  (first connector  11 ) and the second connector  12  are to be connected, and the terminal  13  (first terminal  13 ) and the second terminal  23  are to be connected, the terminal connection portion  25  of the second terminal  23  is inserted into the tubular wall portion  33  of the terminal  13 . The terminal  13  and the second terminal  23  are electrically and mechanically connected by the terminal connection portion  25  of the second terminal  23  being mated to the tubular wall portion  33  of the terminal  13 . When the second terminal  23  is to be mated to the terminal  13 , the terminal connection portion  25  of the second terminal  23  is inserted into the tubular wall portion  33  through the terminal insertion opening  33   a  of the tubular wall portion  33  of the terminal  13  that is open on the leading end side of the tubular wall portion  33 . 
       FIG. 19  is a diagram showing a cross-section taken along line C-C in  FIG. 17  and viewed in the direction indicated by arrows.  FIG. 20  is a diagram showing a cross-section taken along line D-D in  FIG. 17  and viewed in the direction indicated by arrows. As shown in  FIGS. 13 to 20 , multiple abutting portions ( 34 ,  35 ) are provided. The present embodiment illustrates a mode of the terminal  13  in which two abutting portions ( 34 ,  35 ) are provided. 
     The abutting portions ( 34 ,  35 ) are each provided as a portion of the edge portion of the upper wall portion  47 . More specifically the abutting portions ( 34 ,  35 ) are each a portion of the edge portion of the upper wall portion  47 , and are each provided as a portion of the edge portion of the upper wall portion  47  that is arranged at a position that opposes an edge portion of the first side wall portion  44  via a gap. Also, the abutting portions ( 34 ,  35 ) are configured to abut against the edge portions of the first side wall portion  44  when the upper wall portion  47  bends toward the inside of the tubular wall portion  33 . 
     Also, the abutting portions ( 34 ,  35 ) are provided at positions on the upper wall portion  47  that are separated from each other in the longitudinal direction of the tubular wall portion  33 . The abutting portion  34  is provided in an end portion of the upper wall portion  47  on the leading end side in the direction of insertion of the tubular wall portion  33  into the housing  14  (i.e., on the terminal insertion opening  33   a  side in the longitudinal direction of the tubular wall portion  33 ). On the other hand, the abutting portion  35  is provided in an end portion of the upper wall portion  47  on the side opposite to the leading end side of the tubular wall portion  33  (i.e., the side opposite to the terminal insertion opening  33   a  side in the longitudinal direction of the tubular wall portion  33 ). 
     As shown in  FIGS. 13 to 20 , the projection portion  36  of the terminal  13  projects from the upper wall portion  47  in the shape of a protrusion or a projection. Furthermore, the projection portion  36  is configured to abut against the housing  14  when the tubular wall portion  33  is inserted into the housing  14  in an orientation different from a predetermined insertion orientation. By abutting against the housing  14  in this way, the projection portion  36  is configured to restrict insertion of the tubular wall portion  33  toward the back of the housing  14  in an orientation different from a predetermined insertion orientation. In other words, the projection portion  36  is provided in the terminal  13  as an erroneous attachment prevention portion for preventing erroneous attachment of the terminal  13  to the housing  14 . 
     Also, the projection portion  36  protrudes from an edge portion of the upper wall portion  47  in the present embodiment. More specifically, the projection portion  36  has a bent portion  36   a  and a projecting end portion  36   b . The bent portion  36   a  is integrated with a portion of the edge portion of the upper wall portion  47 , and is provided as a portion that extends while bending relative to the upper wall portion  47 . The projecting end portion  36   b  is provided as a portion that projects and extends from the bent portion  36   a  in a cantilevered manner. The projecting end portion  36   b  is provided in a manner of projecting from the upper wall portion  47  along a direction approximately perpendicular to the planar direction in which the upper wall portion  47  extends. Furthermore, the projection portion  36  is provided on the leading end side of the tubular wall portion  33  in the direction of insertion of the tubular wall portion  33  into the housing  14 . 
     The projection portion  36  is configured to be fitted into and slide in an insertion orientation restriction groove  18  of the housing  14  when the tubular wall portion  33  is inserted into a terminal insertion hole  16  of the housing  14  in a predetermined insertion orientation. When the tubular wall portion  33  is inserted into the terminal insertion hole  16  of the housing  14  in the predetermined insertion orientation, the terminal  13  is properly fitted into the housing  14  and inserted to the back thereof. Accordingly, the aforementioned predetermined insertion orientation for properly fitting the terminal  13  to the back of the housing  14  is configured as an orientation in which the tubular wall portion  33  is inserted into the terminal insertion hole  16  of the housing  14  such that the projection portion  36  is fitted into and slides in the insertion orientation restriction groove  18 . 
     If the tubular wall portion  33  is inserted into the terminal insertion hole  16  of the housing  14  in an orientation different from the predetermined insertion orientation, the projection portion  36  abuts against the edge portion of the opening of the terminal insertion hole  16  in the housing  14 . In other words, the projection portion  36  abuts against a portion of the edge portion of the terminal insertion hole  16  that is different from the portion where the insertion orientation restriction groove  18  is provided. Accordingly, if the tubular wall portion  33  is inserted into the terminal insertion hole  16  of the housing  14  in an orientation different from the predetermined insertion orientation, the projection portion  36  abuts against the edge portion of the terminal insertion hole  16 , thus restricting insertion of the tubular wall portion  33  toward the back of the housing  14 . In other words, erroneous attachment of the terminal  13  to the housing  14  is prevented. 
     Note that the projection portion  36  that protrudes from the edge portion of the upper wall portion  47  is arranged adjacent to the abutting portion  34  via a notch portion  48  in the edge portion of the upper wall portion  47 . In other words, the notch portion  48  is provided between the abutting portion  34  and the projection portion  36  in the edge portion of the upper wall portion  47 . Also, the abutting portion  34  and the projection portion  36  are arranged on the edge portion of the upper wall portion  47  via a gap therebetween that is defined by the notch portion  48  formed with a receding shape. In this way, by providing the notch portion  48  between the abutting portion  34  and the projection portion  36  in the edge portion of the upper wall portion  47 , it is possible to suppress the case where external force applied to one of these two causes excessive stress to also be applied to the other one. In other words, by providing the notch portion  48 , it is possible to suppress the case where external force applied to one of the abutting portion  34  and the projection portion  36  causes excessive stress to also be applied to the other one of the abutting portion  34  and the projection portion  36  to which external force was not directly applied. 
       FIG. 21  is a diagram showing a cross-section taken along line E-E in  FIG. 18  and viewed in the direction indicated by arrows. As shown in  FIGS. 4, 13, 15 to 17, 19, and 21 , the engaging portion  37  is provided on the tubular wall portion  33 , and is provided on the bottom wall portion  45  of the tubular wall portion  33  in the present embodiment. Also, the engaging portion  37  is configured to be capable of engaging with an engaged portion  17  provided inside the housing  14  when the tubular wall portion  33  is inserted into the housing  14  in the above-described predetermined insertion orientation. 
     In the present embodiment, the engaging portion  37  is formed by cutting and bending a portion of the bottom wall portion  45  toward the outside of the tubular wall portion  33 , and is provided as a portion that projects outward from the bottom wall portion  45 . Furthermore, the engaging portion  37  projects outward from the bottom wall portion  45  in a direction from the leading end side in the direction of insertion of the tubular wall portion  33  into the housing  14  toward the opposite side in this insertion direction, and also in a direction oblique to the longitudinal direction of the tubular wall portion  33 . Accordingly, when the tubular wall portion  33  is inserted into the terminal insertion hole  16  of the housing  14  in the predetermined insertion orientation, the engaging portion  37  and the engaged portion  17  reliably engage with each other, thus preventing the tubular wall portion  33  from coming out of the terminal insertion hole  16 . In other words, even if external force in the direction of removal from the terminal insertion hole  16  is applied to the tubular wall portion  33 , the leading end portion of the engaging portion  37  is fitted into and reliably engaged with the recession portion  17   a  of the engaged portion  17 , thus preventing the tubular wall portion  33  from coming out of the terminal insertion hole  16 . 
     Also, the engaging portion  37  of the terminal  13  and the engaged portion  17  of the housing  14  are configured such that when the tubular wall portion  33  is inserted into the housing  14  in the above-described predetermined insertion orientation, the engaging portion  37  and the engaged portion  17  can engage with each other by one of them abutting against the other one, elastically deforming, and then undergoing elastic recovery. Note that the engaging portion  37  and the engaged portion  17  of the present embodiment are configured such that when the tubular wall portion  33  is inserted into the housing  14  in the predetermined insertion orientation, the engaging portion  37  and the engaged portion  17  can engage with each other by the engaged portion  17  abutting against the engaging portion  37 , elastically deforming, and then undergoing elastic recovery. In other words, in the present embodiment, when the tubular wall portion  33  is inserted into the terminal insertion hole  16  in the predetermined insertion orientation, the engaged portion  17  abuts against the engaging portion  37  and elastically deforms by temporarily bending so as to ride over the engaging portion  37 . Then, when the tubular wall portion  33  has been inserted to the back of the terminal insertion hole  16 , the engaged portion  17  undergoes elastic recovery and the leading end portion of the engaging portion  37  is maintained in the state of being located at a position of being able to be fitted into and engaged with the recession portion  17   a  of the engaged portion  17 . 
     Also, the engaging portion  37  is provided at a position on the tubular wall portion  33  that is shifted from or separated from the projection portion  36  in the longitudinal direction of the tubular wall portion  33  (see  FIG. 17 ). In the present embodiment, the projection portion  36  is provided on the tubular wall portion  33  at a position on the leading end side relative to the engaging portion  37  in the direction of insertion of the tubular wall portion  33  into the housing  14 . The engaging portion  37  is provided on the tubular wall portion  33  at a position that is shifted from or separated from the projection portion  36  in the direction opposite to the insertion direction. 
     As shown in  FIGS. 5, 15, 16, and 19 to 21 , the electrical contact portions ( 38 ,  39 ) are provided inside the tubular wall portion  33 . The electrical contact portions ( 38 ,  39 ) are configured as portions that are electrically connected to the terminal connection portion  25  of the second terminal  23  when the terminal connection portion  25  is inserted into the tubular wall portion  33 . In the present embodiment, a pair of electrical contact portions ( 38 ,  39 ) are provided, and these electrical contact portions come into contact with the terminal connection portion  25  in a manner of sandwiching side surfaces of the terminal connection portion  25  on respective sides thereof when the terminal connection portion  25  is mated to the tubular wall portion  33 . Accordingly, the electrical contact portions ( 38 ,  39 ) and the terminal connection portion  25  are electrically connected to each other, and the terminal  13  and the second terminal  23  are electrically connected to each other. 
     As shown in  FIGS. 5 and 13 to 21 , a pair of contact spring portions ( 40 ,  41 ) are provided. The pair of contact spring portions ( 40 ,  41 ) are respectively provided as a portion of the first side wall portion  44  and a portion of the second side wall portion  46 , and are each a plate spring-shaped portion that extends in a cantilevered manner. More specifically, the contact spring portion  40  is provided as a portion of the first side wall portion  44 , and is provided as a plate spring-shaped portion that extends in a cantilevered manner along the longitudinal direction of the tubular wall portion  33 . Also, the contact spring portion  41  is provided as a portion of the second side wall portion  46 , and is provided as a plate spring-shaped portion that extends in a cantilevered manner along the longitudinal direction of the tubular wall portion  33 . 
     As described above, the contact spring portion  40 , which is a portion of the first side wall portion  44 , extends in a cantilevered manner along the longitudinal direction of the tubular wall portion  33 . For this reason, out of the edge portions of the contact spring portion  40  on the two sides that extend along the longitudinal direction of the tubular wall portion  33 , one opposes an edge portion of the bottom wall portion  45  via a gap, and the other opposes an edge portion of the upper wall portion  47  via a gap. 
     Also, the contact spring portion  41 , which is a portion of the second side wall portion  46 , extends in a cantilevered manner along the longitudinal direction of the tubular wall portion  33 . For this reason, out of the edge portions of the contact spring portion  41  on the two sides that extend along the longitudinal direction of the tubular wall portion  33 , one opposes an edge portion of the bottom wall portion  45  via a gap, and the other opposes an edge portion of the upper wall portion  47  via a gap. 
     Also, the contact spring portions ( 40 ,  41 ) are arranged inward of the edge portions of the upper wall portion  47  with respect to the width direction of the tubular wall portion  33 . More specifically the contact spring portion  40  has a portion that is bent inward in the width direction of the tubular wall portion  33 , and is arranged inward, with respect to the width direction of the tubular wall portion  33 , of the edge of the upper wall portion  47  on the first side wall portion  44  side. Also, the contact spring portion  41  has a portion that is bent inward in the width direction of the tubular wall portion  33 , and is arranged inward, with respect to the width direction of the tubular wall portion  33 , of the edge of the upper wall portion  47  on the second side wall portion  46  side. Note that the width direction of the tubular wall portion  33  is a direction that is perpendicular to the longitudinal direction of the tubular wall portion  33 , and is the direction in which the first side wall portion  44  and the second side wall portion  46  oppose each other. 
     Also, in the present embodiment, the electrical contact portions ( 38 ,  39 ) are respectively provided on the leading end sides of the pair of contact spring portions ( 40 ,  41 ) that extend in a cantilevered manner. Note that the electrical contact portion  38  is provided on the inward side of the leading end side of the contact spring portion  40 . Also, the electrical contact portion  39  is provided on the inward side of the leading end side of the contact spring portion  41 . 
     As shown in  FIGS. 4, 5, 13 to 18, and 21 , the terminal  13  is provided with the electrical wire crimping portion  42  and the conductor crimping portion  43  as portions that are attached and fixed by being crimped to an end portion of an electrical wire  101 . The electrical wire crimping portion  42  is provided as a portion that is attached and fixed by being crimped to the end portion of the electrical wire  101  from outside of a covering portion  101   a . The electrical wire crimping portion  42  has a pair of claw portions that are bent in order to be crimped to the end portion of the electrical wire  101 . The conductor crimping portion  43  is provided as a portion that is attached and fixed by being crimped to a portion of the end portion of the electrical wire  101  in which the covering portion  101   a  has been removed to expose a conductor  101   b . The conductor crimping portion  43  has a pair of claw portions that are bent in order to be crimped to the end portion of the electrical wire  101 . The terminal  13  is electrically and mechanically connected to the electrical wire  101  by the conductor crimping portion  43  being attached to the conductor  101   b  in the end portion of the electrical wire  101 . Also, the terminal  13  is mechanically connected to the electrical wire  101  more robustly by the electrical wire crimping portion  42  being attached to the end portion of the electrical wire  101 . 
     Actions and Effects of Present Embodiment 
     When the tubular wall portion  33  of the terminal  13  of the present embodiment is inserted into the housing  14  of the connector  11  in an orientation different from the predetermined insertion orientation, the projection portion  36  abuts against the housing  14 , thus restricting insertion of the tubular wall portion  33  toward the back of the housing  14 . Accordingly, erroneous attachment of the terminal  13  to the housing  14  is prevented. In other words, in the terminal  13 , the projection portion  36  is provided as an erroneous attachment prevention portion for preventing erroneous attachment of the terminal  13  to the housing  14 . 
     Also, the terminal  13  of the present embodiment is provided with the engaging portion  37  that can engage with the engaged portion  17  inside the housing  14  when the terminal  13  is inserted into the housing  14  in the predetermined insertion orientation. The engaging portion  37  and the engaged portion  17  can engage with each other by one of them abutting against the other one, elastically deforming, and then undergoing elastic recovery. Due to the above-described engagement of the engaging portion  37  of the terminal  13  to the housing  14 , when the terminal  13  is inserted into the housing  14 , the terminal  13  is prevented from coming out of and being withdrawn from the housing  14 . In other words, in the terminal  13 , the engaging portion  37  is provided as a withdrawal prevention portion for preventing the terminal  13  from being withdrawn from the housing  14 . 
     Furthermore, in the terminal  13  of the present embodiment, the engaging portion  37  is provided at a position on the tubular wall portion  33  that is shifted from or separated from the projection portion  36  in the longitudinal direction. For this reason, according to the terminal  13  of the present embodiment, the projection portion  36  serving as the erroneous attachment prevention portion and the engaging portion  37  serving as the withdrawal prevention portion are provided in a state of being shifted or separated and independent in the longitudinal direction of the tubular wall portion  33 . Thus, according to the terminal  13  of the present embodiment, it is possible to suppress the case where the projection portion  36  serving as the erroneous attachment prevention portion and the engaging portion  37  serving as the withdrawal prevention portion are constrained by the positions of one another. 
     Also, according to the terminal  13  of the present embodiment, the tubular wall portion  33  is constituted by integrally providing the first side wall portion  44 , the bottom wall portion  45 , the second side wall portion  46 , and the upper wall portion  47  in the stated order, and thus is constituted with a simple structure. Furthermore, in the terminal  13  of the present embodiment, the projection portion  36  serving as the erroneous attachment prevention portion is constituted with a simple structure of projecting from the upper wall portion  47  in the shape of a protrusion or a projection. Also, according to the terminal  13  of the present embodiment, portions of the edge portion of the upper wall portion  47  are constituted as abutting portions ( 34 ,  35 ) that abut against the edge portion of the first side wall portion  44  when the upper wall portion  47  bends toward the inside of the tubular wall portion  33 . For this reason, even in the case where the terminal  13  is inserted into the housing  14  in an orientation different from the predetermined insertion orientation, the projection portion  36  abuts against the housing  14 , and the upper wall portion  47  provided with the projection portion  36  bends toward the inside of the tubular wall portion  33 , the abutting portions ( 34 ,  35 ) abut against the edge portion of the first side wall portion  44 , thus preventing the upper wall portion  47  from collapsing into the interior of the tubular wall portion  33 . Accordingly, the projection portion  36  is maintained in a state of abutting against the housing  14 , and appropriate operation of the projection portion  36  serving as the erroneous attachment prevention portion is ensured. Also, according to the terminal  13  of the present embodiment, the structure for ensuring appropriate operation of the projection portion  36  serving as the erroneous attachment prevention portion is realized by a simple structure including the tubular wall portion  33  that has a simple structure, the projection portion  36  that has a simple structure, and the abutting portions ( 34 ,  35 ) that have a simple structure, are provided as portions of the edge portion of the upper wall portion  47 , and abut against the edge portion of the first side wall portion  44 . Thus, according to the terminal  13  of the present embodiment, it is possible to use a simple structure to ensure appropriate operation of the erroneous attachment prevention portion. 
     As described above, according to the present embodiment, it is possible to provide a terminal  13  that can suppress the case in which the position of an erroneous attachment prevention portion, which is for preventing erroneous attachment of the terminal  13  to the housing  14 , and the position of a withdrawal prevention portion, which is for preventing the terminal  13  from being withdrawn from the housing  14 , are constrained by the positions of one another, and that enables realizing a simple structure for ensuring appropriate operation of the erroneous attachment prevention portion. 
     Also, according to the present embodiment, the projection portion  36  is provided on the leading end side in the direction of insertion of the terminal  13  into the housing  14 . For this reason, when the terminal  13  is inserted into the housing  14  in an orientation different from the predetermined insertion orientation, the projection portion  36  abuts against the edge portion of the opening of the terminal insertion hole  16 , which is the hole of the housing  14  into which the terminal  13  is inserted, and most of the portion of the terminal  13  other than the portion on the leading end side of the tubular wall portion  33  is exposed from the housing  14 . Accordingly the erroneous attachment state, in which the terminal  13  has been inserted into the housing  14  in an orientation different from the predetermined insertion orientation, is shown more clearly. Therefore, the operator who is performing the operation of inserting the terminal  13  into the housing  14  can quickly and easily see and recognize that erroneous attachment has occurred. 
     Furthermore, according to the present embodiment, the engaging portion  37  is provided on the tubular wall portion  33  at a position that is shifted from or separated from the projection portion  36  in the direction opposite to the direction of insertion of the terminal  13  into the housing  14 . For this reason, the position of the engaging portion  37  serving as the withdrawal prevention portion is set to a position that is shifted or separated to the side opposite to the leading end side of the terminal  13 , thus suppressing the case where this position is constrained by the position of the projection portion  36  provided on the leading end side of the terminal  13 . Also, due to the position of the engaging portion  37  being set to a position that is shifted from or separated from the leading end side of the terminal  13 , the engaging portion  37  can be provided in a portion that has higher rigidity in the tubular wall portion  33 . Accordingly, an engaging portion  37  having higher rigidity can be constituted easily. 
     Also, according to the present embodiment, the projection portion  36  is constituted with a simple structure including the bent portion  36   a  that is integrated with a portion of the edge portion of the upper wall portion  47 , and the projecting end portion  36   b  that extends from the bent portion  36   a  in a cantilevered manner. Accordingly, the projection portion  36  can be realized with an even simpler structure. 
     Also, according to the present embodiment, the pair of contact spring portions ( 40 ,  41 ) respectively provided with the electrical contact portions ( 38 ,  39 ) are constituted as a portion of the first side wall portion  44  and a portion of the second side wall portion  46 . For this reason, a portion of the first side wall portion  44  and a portion of the second side wall portion  46  can be caused to function as the pair of contact spring portions ( 40 ,  41 ), and the pair of contact spring portions ( 40 ,  41 ) can be realized with a simple structure. Furthermore, the pair of contact spring portions ( 40 ,  41 ), which are provided as plate spring-shaped portions that extend in a cantilevered manner, and are provided with the electrical contact portions ( 38 ,  39 ) on the leading end side, are constituted as a portion of the first side wall portion  44  or the second side wall portion  46 . According to this configuration, it is possible to easily set a long length for the arm length from the base portions of the plate springs, which extend in a cantilevered manner, to the electrical contact portions ( 38 ,  39 ) on the leading end side. Also, the pair of contact spring portions ( 40 ,  41 ) are provided in the first side wall portion  44  and the second side wall portion  46 , and are not provided on the upper wall portion  47 , thus making it possible to suppress the case of influencing the strength of the upper wall portion  47 , which is the portion on which the projection portion  36  is provided. 
     Also, according to the present embodiment, the contact spring portions ( 40 ,  41 ), which are provided as portions of the first and second side wall portions ( 44 ,  46 ) respectively, are arranged inward of the edge portions of the upper wall portion  47  in the width direction of the tubular wall portion  33 . For this reason, even if the terminal  13  comes into contact with an outside object, it is possible to effectively suppress the case where the outside object comes into contact with and applies external force to the contact spring portions ( 40 ,  41 ) and deforms or breaks the contact spring portions ( 40 ,  41 ). In particular, when multiple terminals  13  are conveyed in a collective manner, it is possible to effectively suppress the case where another terminal  13  comes into contact with and applies external force to the contact spring portions ( 40 ,  41 ) and deforms or breaks the contact spring portions ( 40 ,  41 ). 
     Also, according to the present embodiment, multiple abutting portions ( 34 ,  35 ) are provided as portions of the edge portion of the upper wall portion  47 . Furthermore, the abutting portions ( 34 ,  35 ) are provided at positions that are separated from each other in the longitudinal direction of the tubular wall portion  33 . For this reason, even in the case where the terminal  13  is inserted into the housing  14  in an orientation different from the predetermined insertion orientation, the projection portion  36  abuts against the housing  14 , and the upper wall portion  47  provided with the projection portion  36  bends toward the inside of the tubular wall portion  33 , the abutting portions ( 34 ,  35 ) that are separated from each other abut against the edge portion of the first side wall portion  44 . This therefore more reliably prevents the upper wall portion  47  from collapsing into the interior of the tubular wall portion  33 . Also, the projection portion  36  can be more reliably maintained in a state of abutting against the housing  14 , and appropriate operation of the projection portion  36  serving as the erroneous attachment prevention portion can be more reliably ensured. 
     Also, effects similar to those of the terminal  13  can be achieved by the connector  11  of the present embodiment. In other words, according to the present embodiment, it is possible to provide the connector  11  that includes the terminal  13  that can suppress the case in which the positions of the erroneous attachment prevention portion and the withdrawal prevention portion are constrained by the positions of one another, and that realizes a simple structure for ensuring appropriate operation of the erroneous attachment prevention portion. Also, according to the present embodiment, in the housing  14  of the connector  11  as well, the position of the engaged portion  17  that is engaged to the engaging portion  37  of the terminal  13  and the position of the insertion orientation restriction groove  18 , which is the portion that corresponds to the projection portion  36  of the terminal  13 , can be set to independent positions. For this reason, in the housing  14  of the connector  11  as well, it is possible to suppress the case where the position of the engaged portion  17  that is engaged to the engaging portion  37  of the terminal  13  and the position of the portion that corresponds to the projection portion  36  of the terminal  13  are constrained by the positions of one another. Furthermore, this makes it possible to improve the degree of freedom in the design of the connector  11 . 
     Also, effects similar to those of the terminal  13  can be achieved by the electrical connection apparatus  1  of the present embodiment. In other words, according to the present embodiment, it is possible to provide the electrical connection apparatus  1  that includes the terminal  13  that can suppress the case in which the positions of the erroneous attachment prevention portion and the withdrawal prevention portion are constrained by the positions of one another, and that realizes a simple structure for ensuring appropriate operation of the erroneous attachment prevention portion. Also, according to the present embodiment, the flat surface  31  faces the outside through the opening  28   a  of the mating portion  28  of the second housing  24  on the inner side of the mating portion  28  of the second housing  24  of the second connector  12 , and extends in a flat manner along the direction perpendicular to the direction in which the first housing  14  of the first connector  11  is inserted. For this reason, when the second connector  12  is suctioned and conveyed by a conveying suction apparatus for mounting to the substrate  100 , the second connector  12  can be easily suctioned on the flat surface  31 . Furthermore, the second connector  12  can be held in a stable state by the conveying suction apparatus. Accordingly, the second connector  12  can be easily mounted to the substrate  100 . Also, as previously described, the first connector  11  of the electrical connection apparatus  1  makes it possible to improve the degree of freedom in design. Therefore, according to the electrical connection apparatus  1  of the present embodiment, it is possible to improve the degree of freedom in the design of the first connector  11 , and the second connector  12  can be easily mounted to the substrate  100 . 
     Variations 
     Although an embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the description of the claims. In other words, the present invention is not limited to the above embodiment, and all modifications, applications, and equivalents thereof that fall within the claims, for which modifications and applications would become naturally apparent by reading and understanding the present specification, are intended to be embraced in the claims of the invention. For example, modifications such as the following may be made. 
     (1)  FIG. 22  is a front view of a terminal  51  according to a first variation. The terminal  51  according to the first variation has a similar configuration to the terminal  13  of the above embodiment, but is different from the terminal  13  of the above embodiment with respect to the configuration of engaging portions ( 37 ,  61 ,  62 ,  63 ). The following describes only configurations of the terminal  51  of the first variation that are different from the terminal  13  of the above embodiment. Also, redundant descriptions of elements having a configuration similar to the above embodiment will be appropriately omitted by assigning the same reference signs in the drawings or citing the descriptions of such elements given in the above embodiment. 
     Although the terminal  13  is provided with only one engaging portion  37 , the terminal  51  is provided with multiple engaging portions ( 37 ,  61 ,  62 ,  63 ) as shown in  FIG. 22 . Note that  FIG. 22  shows an example of a mode in which the terminal  51  is provided with four engaging portions ( 37 ,  61 ,  62 ,  63 ). 
     The engaging portion  37  is configured similarly to the engaging portion  37  of the terminal  13 , and is provided on the bottom wall portion  45 . The engaging portion  61  is configured similarly to the engaging portion  37  of the terminal  13 , and is provided on the first side wall portion  44 . The engaging portion  62  is configured similarly to the engaging portion  37  of the terminal  13 , and is provided on the second side wall portion  46 . The engaging portion  63  is configured similarly to the engaging portion  37  of the terminal  13 , and is provided on the upper wall portion  47 . 
     The engaging portions ( 37 ,  61 ,  62 ,  63 ) are each provided in the tubular wall portion  33 , and are configured to be able to engage with engaged portions (not shown) provided inside the housing (not shown) that is to hold the terminal  51  when the tubular wall portion  33  is inserted into the housing in a predetermined insertion orientation. 
     A mode is possible in which multiple engaging portions ( 37 ,  61 ,  62 ,  63 ) are provided, as with the terminal  51  of the first variation. Also, the number of engaging portions and the positions thereof are not limited to the examples of the terminal  13  and the terminal  51 , and may be modified in various ways. In other words, a mode is possible in which the terminal is provided with two, three, or five or more engaging portions. Also, the position where the engaging portion is provided need only be a position on the tubular wall portion, and may be a position on at least any one of the first side wall portion, the bottom wall portion, the second side wall portion, and the upper wall portion. Also, a connector including the terminal of the above variation is also encompassed in the present invention. Furthermore, an electrical connection apparatus including the terminal of the above variation is also encompassed in the present invention. 
     (2)  FIG. 23  is a front view of a terminal  52  according to a second variation. The terminal  52  according to the second variation has a similar configuration to the terminal  13  of the above embodiment, but is different from the terminal  13  of the above embodiment with respect to the configuration of the projection portion  64 . The following describes only configurations of the terminal  52  of the second variation that are different from the terminal  13  of the above embodiment. Also, redundant descriptions of elements having a configuration similar to the above embodiment will be appropriately omitted by assigning the same reference signs in the drawings or citing the descriptions of such elements given in the above embodiment. 
     Although the projection portion  36  of the terminal  13  is provided on an edge portion of the upper wall portion  47 , the projection portion  64  of the terminal  52  is provided in the central portion, with respect to the width direction, of the upper wall portion  47  as shown in  FIG. 23 . Note that the width direction of the upper wall portion  47  is the same direction as the width direction of the tubular wall portion  33 . 
     The projection portion  64  protrudes from the central portion in the width direction of the upper wall portion  47  in the shape of protrusion or a projection. Furthermore, the projection portion  64  is configured to abut against the housing (not shown) that is to hold the terminal  52  when the tubular wall portion  33  is inserted into the housing in an orientation different from a predetermined insertion orientation. By abutting against the housing in this way, the projection portion  64  is configured to restrict insertion of the tubular wall portion  33  toward the back of the housing in an orientation different from a predetermined insertion orientation. 
     A mode is possible in which the projection portion  64  is provided on a portion other than an edge portion of the upper wall portion  47 , as with the terminal  52  of the second variation. Also, the number of projection portions and the positions thereof on the upper wall portion are not limited to the examples of the terminal  13  and the terminal  52 , and may be modified in various ways. Also, a connector including the terminal of the above variation is also encompassed in the present invention. Furthermore, an electrical connection apparatus including the terminal of the above variation is also encompassed in the present invention. 
     (3)  FIG. 24  is a side view of a terminal  53  according to a third variation, and is a partial cutaway view of the terminal  53  according to the third variation. The terminal  53  according to the third variation has a similar configuration to the terminal  13  of the above embodiment, but is different from the terminal  13  of the above embodiment with respect to the shape of an engaging portion  65 . The following describes only configurations of the terminal  53  of the third variation that are different from the terminal  13  of the above embodiment. Also, redundant descriptions of elements having a configuration similar to the above embodiment will be appropriately omitted by assigning the same reference signs in the drawings or citing the descriptions of such elements given in the above embodiment. 
     The engaging portion  65  of the terminal  53  is provided on the bottom wall portion  45  of the tubular wall portion  33 . The engaging portion  65  of the terminal  53  is configured to be able to engage with an engaged portion (not shown) provided inside the housing (not shown) that is to hold the terminal  53  when the tubular wall portion  33  is inserted into the housing in a predetermined insertion orientation. Also, similarly to the engaging portion  37  of the terminal  13 , the engaging portion  65  of the terminal  53  projects outward from the bottom wall portion  45  in a direction from the leading end side in the direction of insertion of the tubular wall portion  33  into the housing toward the opposite side in this insertion direction, and also in a direction oblique to the longitudinal direction of the tubular wall portion  33 . However, the engaging portion  65  of the terminal  53  projects from a position that is closer to the leading end side of the tubular wall portion  33  than the position of the engaging portion  37  of the terminal  13 , and also has a longer projection length. In other words, the projection length of the engaging portion  65  of the terminal  53 , which projects outward from the bottom wall portion  45  in a direction from the leading end side in the direction of insertion of the tubular wall portion  33  into the housing toward the opposite side in this insertion direction, and also in a direction oblique to the longitudinal direction of the tubular wall portion  33 , is set longer than the projection length of the engaging portion  37  of the terminal  13 . 
     A mode is possible in which the engaging portion has a different shape, as with the terminal  53  of the third variation. Also, the shape of the engaging portion is not limited to the examples of the terminal  13  and the terminal  53 , and may be modified in various ways. Also, a connector including the terminal of the above variation is also encompassed in the present invention. Furthermore, an electrical connection apparatus including the terminal of the above variation is also encompassed in the present invention. 
     (4)  FIG. 25  is a perspective view of a terminal  54  according to a fourth variation, and is a partial cutaway view of the terminal  54  according to the fourth variation. The terminal  54  according to the fourth variation has a similar configuration to the terminal  13  of the above embodiment, but is different from the terminal  13  of the above embodiment with respect to the configurations of the projection portion  66  and the abutting portion  67 . The following describes only configurations of the terminal  54  of the fourth variation that are different from the terminal  13  of the above embodiment. Also, redundant descriptions of elements having a configuration similar to the above embodiment will be appropriately omitted by assigning the same reference signs in the drawings or citing the descriptions of such elements given in the above embodiment. 
     In the terminal  13 , the abutting portion  34  is provided on the end portion of the upper wall portion  47  on the leading end side in the direction of insertion of the tubular wall portion  33  into the housing  14 , and the projection portion  36  is provided on the side opposite to the leading end side of the tubular wall portion  33 , relative to the abutting portion  34 . However, in the terminal  54 , the positions of the abutting portion  67  and the projection portion  66  are set opposite to the positions of the abutting portion  34  and the projection portion  36 . Specifically, the projection portion  66  of the terminal  54  is provided on the end portion on the leading end side in the direction of insertion of the tubular wall portion  33  into the housing (the housing that is to hold the terminal  54 ). Also, the abutting portion  67  is provided on the side opposite to the leading end side of the tubular wall portion  33 , relative to the projection portion  66 . 
     Also, in the terminal  13 , the projection portion  36  is provided on an edge portion of the upper wall portion  47  that extends along the longitudinal direction of the tubular wall portion  33 . However, unlike the terminal  13 , in the terminal  54 , the projection portion  66  protrudes from an edge portion on the terminal insertion opening  33   a  side of the upper wall portion  47  in the shape of a protrusion or a projection. Also, the projection portion  66  is configured to abut against the housing (not shown) that is to hold the terminal  54  when the tubular wall portion  33  is inserted into the housing in an orientation different from a predetermined insertion orientation. Furthermore, by abutting against the housing in this way, the projection portion  66  is configured to restrict insertion of the tubular wall portion  33  toward the back of the housing in an orientation different from a predetermined insertion orientation. 
     Similarly to the abutting portion  34  of the terminal  13 , the abutting portion  67  of the terminal  54  is provided as a portion of an edge portion of the upper wall portion  47 . However, the abutting portion  67  is provided integrated with and adjacent to the projection portion  66  without the notch portion  48  of the terminal  13  therebetween, and furthermore is provided on the side opposite to the leading end side of the tubular wall portion  33 , relative to the projection portion  66 . The abutting portion  67  is a portion of the edge portion of the upper wall portion  47 , and is provided as a portion of the edge portion of the upper wall portion  47  that is arranged at a position that opposes an edge portion of the first side wall portion  44  via a gap. Also, the abutting portion  67  is configured to abut against the edge portion of the first side wall portion  44  when the upper wall portion  47  bends toward the inside of the tubular wall portion  33 . 
     A mode is possible in which the projection portion  66  is provided on an edge portion on the terminal insertion opening  33   a  side of the upper wall portion  47 , as with the terminal  54  of the fourth variation. Also, a connector including the terminal of the above variation is also encompassed in the present invention. Furthermore, an electrical connection apparatus including the terminal of the above variation is also encompassed in the present invention. 
     (5)  FIG. 26  is a perspective view of a terminal  55  according to a fifth variation, and is a partial cutaway view of the terminal  55  according to the fifth variation. The terminal  55  according to the fifth variation has a similar configuration to the terminal  13  of the above embodiment, but is different from the terminal  13  of the above embodiment with respect to the configurations of the projection portion  68  and the abutting portion  69 . The following describes only configurations of the terminal  55  of the fifth variation that are different from the terminal  13  of the above embodiment. Also, redundant descriptions of elements having a configuration similar to the above embodiment will be appropriately omitted by assigning the same reference signs in the drawings or citing the descriptions of such elements given in the above embodiment. 
     In the terminal  13 , the projection portion  36  is provided on an edge portion of the upper wall portion  47 . However, in the terminal  55 , the projection portion  68  is not provided on an edge portion of the upper wall portion  47 , and is instead formed by cutting a portion of the upper wall portion  47  and bending it toward the outside of the tubular wall portion  33 . More specifically, the upper wall portion  47  of the terminal  55  is provide with a cut portion  70  in the central portion in the width direction of the upper wall portion  47 . Note that the width direction of the upper wall portion  47  is the same direction as the width direction of the tubular wall portion  33 . Part of the portion that was cut from the upper wall portion  47  when forming the cut portion  70  is raised up so as to project toward the outside of the tubular wall portion  33 , thus forming the projection portion  68 . 
     The projection portion  68  of the terminal  55  is provided by a portion in the central portion in the width direction of the upper wall portion  47  being cut and raised so as to project in the shape of a protrusion or a projection. Furthermore, the projection portion  68  is configured to abut against the housing (not shown) that is to hold the terminal  55  when the tubular wall portion  33  is inserted into the housing in an orientation different from a predetermined insertion orientation. By abutting against the housing in this way, the projection portion  68  is configured to restrict insertion of the tubular wall portion  33  toward the back of the housing in an orientation different from a predetermined insertion orientation. 
     Similarly to the abutting portion  34  of the terminal  13 , the abutting portion  69  of the terminal  55  is provided as a portion of an edge portion of the upper wall portion  47 . However, the abutting portion  69  is provided as a portion of the edge portion of the upper wall portion  47  that extends a longer length along the longitudinal direction of the tubular wall portion  33 , and is provided so as to be capable of abutting against the edge portion of the first side wall portion  44  at multiple locations. For this reason, the abutting portion  69  is provided in a manner of opposing the edge portion of the first side wall portion  44  at multiple locations via gaps. Also, the abutting portion  69  is configured to abut against the edge portion of the first side wall portion  44  at multiple locations when the upper wall portion  47  bends toward the inside of the tubular wall portion  33 . 
     A mode is possible in which the projection portion  68  is formed by cutting and raising a portion of the upper wall portion  47  so as to project in the shape of a protrusion or a projection, and the abutting portion  69  abuts against the edge portion of the first side wall portion  44  at multiple locations, as with the terminal  55  of the fifth variation. Also, a connector including the terminal of the above variation is also encompassed in the present invention. Furthermore, an electrical connection apparatus including the terminal of the above variation is also encompassed in the present invention. 
     (6)  FIG. 27  is a perspective view of a terminal  56  according to a sixth variation, and is a partial cutaway view of the terminal  56  according to the sixth variation. The terminal  56  of the sixth variation has a similar configuration to the terminal  13  of the above embodiment, but is different from the terminal  13  of the above embodiment in that fitting portions ( 71 ,  72 ) are provided on the upper wall portion  47  and the first side wall portion  44 . The following describes only configurations of the terminal  56  of the sixth variation that are different from the terminal  13  of the above embodiment. Also, redundant descriptions of elements having a configuration similar to the above embodiment will be appropriately omitted by assigning the same reference signs in the drawings or citing the descriptions of such elements given in the above embodiment. 
     The fitting portion  71  is provided as a portion of the upper wall portion  47  that is recessed along the width direction of the upper wall portion  47  in the shape of a groove or a slit. Note that the width direction of the upper wall portion  47  is the same direction as the width direction of the tubular wall portion  33 . On the other hand, the fitting portion  72  is provided as a portion that projects and extends from an edge portion of the first side wall portion  44  in the shape of a cantilevered claw. The fitting portion  72  is shaped so as to fit into the fitting portion  71 . Also, the portion in which the fitting portion  72  is fitted into the fitting portion  71  constitutes a portion of the rectangular tube-shaped tubular wall portion  33 . 
     A mode is possible in which the tubular wall portion  33  is provided with a portion in which the fitting portion  71 , which is recessed in the shape of a groove or a slit, and the fitting portion  72 , which projects and extends in the shape of a cantilevered claw, are fitted together, as with the terminal  56  of the sixth variation. Also, a connector including the terminal of the above variation is also encompassed in the present invention. Furthermore, an electrical connection apparatus including the terminal of the above variation is also encompassed in the present invention. 
     (7)  FIG. 28  is a perspective view of a terminal  57  according to a seventh variation, and is a partial cutaway view of the terminal  57  according to the seventh variation. The terminal  57  according to the seventh variation has a similar configuration to the terminal  13  of the above embodiment, but is different from the terminal  13  of the above embodiment in that a sliding rib  73  is further provided. The following describes only configurations of the terminal  57  of the seventh variation that are different from the terminal  13  of the above embodiment. Also, redundant descriptions of elements having a configuration similar to the above embodiment will be appropriately omitted by assigning the same reference signs in the drawings or citing the descriptions of such elements given in the above embodiment. 
     The sliding rib  73  is provided on an edge portion of the first side wall portion  44 , and protrudes from the edge portion of the first side wall portion  44  in the shape of a protrusion or a projection. Also, the sliding rib  73  is arranged to be aligned along the same straight line as the projection portion  36  in the longitudinal direction of the tubular wall portion  33 . The sliding rib  73  is configured to slide and fit into the insertion orientation restriction groove  18  of the housing  14 , along with the projection portion  36 , when the tubular wall portion  33  is inserted into the terminal insertion hole  16  of the housing  14  in the predetermined insertion orientation. In other words, when the tubular wall portion  33  is inserted into the terminal insertion hole  16  of the housing  14  in the predetermined insertion orientation, first the projection portion  36  slides and fits into the insertion orientation restriction groove  18 , and then the sliding rib  73  slides and fits into the insertion orientation restriction groove  18 . By further providing the sliding rib  73 , the terminal  57  can be inserted more smoothly into the housing  14  in the predetermined insertion orientation. 
     A mode is possible in which the sliding rib  73  is further provided, as with the terminal  57  of the seventh variation. Also, a connector including the terminal of the above variation is also encompassed in the present invention. Furthermore, an electrical connection apparatus including the terminal of the above variation is also encompassed in the present invention. 
     (8) The present invention is not limited to the variations described above, and various other modifications may be made. For example, although a mode in which two abutting portions are provided is illustrated in the above embodiment, the present invention is not limited to this. A mode is possible in which the terminal is provided with one abutting portion or three or more. 
     Also, the above embodiment illustrates a mode of the terminal in which when the tubular wall portion is inserted into the housing in the predetermined insertion orientation, the engaging portion and the engaged portion can engage with each other by the engaged portion abutting against the engaging portion, elastically deforming, and then undergoing elastic recovery, but the present invention is not limited to this. For example, a mode of the terminal is possible in which when the tubular wall portion is inserted into the housing in the predetermined insertion orientation, the engaging portion and the engaged portion can engage with each other by the engaging portion abutting against the engaged portion, elastically deforming, and then undergoing elastic recovery. 
     Also, the above embodiment illustrates a mode of the terminal in which the pair of contact spring portions are respectively provided as a portion of the first side wall portion and a portion of the second side wall portion and extend in a cantilevered manner, but the present invention is not limited to this. For example, a mode of the terminal is possible in which the pair of contact spring portions are not provided, and the electrical contact portions are provided in a manner of rising from the first side wall portion and the second side wall portion toward the inside of the tubular wall portion in the shape of a protrusion. 
     Also, the shape of the first housing of the first connector, the shape of the second housing of the second connector, and the shape of the second terminal of the second connector are not limited to the examples illustrated in the above embodiment, and may be modified in various ways. Also, the mode of the substrate to which the second connector is connected is also not limited to the example illustrated in the above embodiment, and may be modified in various ways. 
     INDUSTRIAL APPLICABILITY 
     The present invention relates to and is broadly applicable to a terminal for a connector that is used in a state of being inserted into a housing of the connector, as well as a connector that includes this terminal, and an electrical connection apparatus that includes this connector.