Abstract:
The purpose of the present invention is to provide a work vehicle with which convenience during boarding/alighting can be improved. Accordingly, provided is a tractor, i.e. a work vehicle, having a step used for boarding/alighting provided in front of a rear wheel thereof. The step is configured from: a receiving part which engages with a foot of an operator; a front support part for supporting a front of the receiving part; and a rear support part for supporting a rear of the receiving part. One end of the front support part is coupled to a cabin frame. Another end of the front support part is coupled to a tractor side end surface of the receiving part. One end of the rear support part is coupled to a front-side end part of a fender of the rear wheel. Another end of the rear support part is coupled to a rear-side end surface of the receiving part.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This is the U.S. national stage of application No. PCT/JP2014/066392, filed on Jun. 20, 2014. Priority under 35 U.S.C. §119(a) and 35 U.S.C. §365(b) is claimed from Japanese Application No. 2013-154032, filed Jul. 24, 2013, the disclosure of which is also incorporated herein by reference. 
     
    
     TECHNICAL FIELD 
       [0002]    The present invention relates to a work vehicle. 
       BACKGROUND ART 
       [0003]    Work vehicles for riding have a step with which a passenger gets on and off and are known. A work vehicle has one or more steps for a foot between the front wheel and the rear wheel and near the passenger door of the cabin. For example, Patent Literature 1 shows it. 
         [0004]    The Working vehicle of Patent Literature 1 has a step provided below the lower end of the fender covering the rear wheel steps configured in a ladder shape. And with the step, the work vehicle is configured for easy getting on and off. However, the work vehicle requires caution for avoiding contact with the end of the fender and the foot of the driver at getting on and off. In additionally, the both side of steps are supported with side boards and it makes the area where the driver put a foot small. 
       CITATION LIST 
     Patent Literature 
       [0005]    Patent Document 1: JP 2000-142112 A 
       SUMMARY OF INVENTION 
     Technical Problem 
       [0006]    The above is a principal object of the present invention to improve the convenience in getting on and off. 
       Solution to Problem 
       [0007]    Technical problems is as described above, it will be described means for solving problems as follows. 
         [0008]    The present invention includes a working vehicle with a step for getting on and off in front of a rear wheel, said step comprising: a receiving portion for a foot of the operator; a front supporting portion supporting the front of the receiving portion; and a rear supporting portion supporting, wherein an end of the front supporting portion is connected to a cabin frame and another end is connected to an end face of the receiving portion where is on the working vehicle side, and wherein an end for the rear supporting portion is connected to a front end of a fender for a rear wheel and another end is connected to an end face of the receiving portion. 
         [0009]    The present invention includes the rear support portion which is formed along the tread surface of the rear wheel with the same radius of curvature of the fender. 
         [0010]    The present invention includes the front support portion which is connected to the receiving part in front of the front side of the cabin, and wherein the rear support portion is connected to the receiving portion at a position lower than the axle of the rear wheel. 
         [0011]    The present invention includes a plurality of triangle shaped through holes are formed in the receiving part, and wherein each side of through holes is arranged so as not to parallel to the crosswise direction of the receiving part. 
       Advantageous Effects of Invention 
       [0012]    Effects of the present invention are described below. 
         [0013]    According to the present invention, as the front supporting portion is not connected with the front end of the receiving portion and the receiving portion is formed to an front end of the fender, the front-back direction width of the receiving portion becomes wider than the width of the bottom part of left and right doors. As the rear supporting portion is connected with the front end of the fender, it is not necessary for an operator to pay attention to hit the fender. Thus it improves convenience at getting on and off. 
         [0014]    According to the present invention, the rear supporting portion and the fender are connected continuously, and it puts away an operator from paying attention to hit the fender at getting on and off. It improves convenience at getting on and off. 
         [0015]    According to the present invention, the receiving portion is formed up to the backward behind the front end of the fender, and the front-back direction width of the receiving portion becomes wider than the width of the bottom part of left and right doors. It improves convenience at getting on and off. 
         [0016]    According to the present invention, each side of through holes is arranged so as not to parallel to the crosswise direction of the receiving part, it increases the stability of the foot on the receiving portion. Thus, convenience for getting on and off is improved. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0017]      FIG. 1  is a perspective front view illustrating the entire constitution of a tractor according to an embodiment of the present invention. 
           [0018]      FIG. 2  is a perspective rear view illustrating the entire constitution of the tractor according to the embodiment of the present invention. 
           [0019]      FIG. 3  is a left side view illustrating the entire constitution of the tractor according to the embodiment of the present invention. 
           [0020]      FIG. 4  is a right side view illustrating the entire constitution of the tractor according to the embodiment of the present invention. 
           [0021]      FIG. 5  is a top view illustrating the entire constitution of the tractor according to the embodiment of the present invention. 
           [0022]      FIG. 6  is a bottom view illustrating the entire constitution of the tractor according to the embodiment of the present invention. 
           [0023]      FIG. 7  is a front view illustrating the entire constitution of the tractor according to the embodiment of the present invention. 
           [0024]      FIG. 8  is a rear view illustrating the entire constitution of the tractor according to the embodiment of the present invention. 
           [0025]      FIG. 9  is a partial enlarged side view illustrating the constitution of a hood of the tractor according to the embodiment of the present invention. 
           [0026]      FIG. 10  is a partial enlarged top view illustrating the constitution of the hood of the tractor according to the embodiment of the present invention. 
           [0027]      FIG. 11A  is a view illustrating ranges representing blind spots from a drive operating unit of a tractor according to a conventional embodiment.  FIG. 11B  is a view illustrating ranges representing blind spots from a drive operating unit of the tractor according to the embodiment of the present invention. 
           [0028]      FIG. 12  is a partial enlarged perspective view illustrating the weight of the tractor and the constitution of a front grille according to the embodiment of the present invention. 
           [0029]      FIG. 13  is a partial enlarged front view illustrating the constitution of head lights according to an embodiment of the present invention. 
           [0030]      FIG. 14  is a partial enlarged side view illustrating the constitution of the head lights according to the embodiment of the present invention. 
           [0031]      FIG. 15  is a partial enlarged top view illustrating the irradiation direction of the LED flash of the head lights according to the embodiment of the present invention. 
           [0032]      FIG. 16  is a partial enlarged front view illustrating the constitution of side view mirrors, front working lights, and side-marker lights according to an embodiment of the present invention. 
           [0033]      FIG. 17  is a partial enlarged front view illustrating the constitution of the side view mirrors, the front working lights, and the side-marker lights according to another embodiment of the present invention. 
           [0034]      FIG. 18A  is a partial enlarged view illustrating the irradiation direction of the side-marker lights according to a first embodiment of the present invention.  FIG. 18B  is a partial enlarged view illustrating the irradiation direction of the side-marker lights according to a second embodiment of the present invention.  FIG. 18C  is a partial enlarged view illustrating the side-marker lights according to a third embodiment of the present invention. 
           [0035]      FIG. 19  is a view illustrating ranges in which the front working lights of the tractor according to the embodiment of the present invention irradiate. 
           [0036]      FIG. 20  is a partial enlarged perspective front view illustrating the constitution of a cabin of the tractor according to the embodiment of the present invention. 
           [0037]      FIG. 21  is a partial enlarged side view illustrating the constitution of the cabin of the tractor according to the embodiment of the present invention. 
           [0038]      FIG. 22  is a partial enlarged rear view illustrating the constitution of the cabin of the tractor according to the embodiment of the present invention. 
           [0039]      FIG. 23  is a view illustrating ranges in which the rear working lights of the tractor according to the embodiment of the present invention irradiate. 
           [0040]      FIG. 24  is a partial enlarged side view illustrating the constitution of a fender and a step of the tractor according to the embodiment of the present invention. 
           [0041]      FIG. 25  is a partial enlarged top view illustrating the constitution of the step the tractor according to the embodiment of the present invention. 
           [0042]      FIG. 26  is a partial enlarged perspective rear view illustrating the constitution of a combination lamp of the tractor according to the embodiment of the present invention. 
           [0043]      FIG. 27A  is a partial rear view illustrating the constitution of the combination lamp according to a first embodiment of the present invention.  FIG. 27B  is a partial rear view illustrating the constitution of the combination lamp according to a second embodiment of the present invention.  FIG. 27C  is a partial rear view illustrating the constitution of the combination lamp according to a third embodiment of the present invention.  FIG. 27D  is a partial rear view illustrating the constitution of the combination lamp according to a fourth embodiment of the present invention. 
           [0044]      FIG. 28  is a partial enlarged perspective view illustrating the constitution of the drive operating unit of the tractor according to the embodiment of the present invention. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0045]    Hereinafter, a tractor  1  of an embodiment of a work vehicle according to the present invention will be described. In the following description, the front, rear, right and left directions are defined based on the advancing direction of the tractor  1  as the front. 
         [0046]    First, the entire constitution of the tractor  1  according to the present invention will be described referring to  FIGS. 1 to 8 . It is noted that the work vehicle according to the present invention is not limited to the tractor  1 , but can be applied to vehicles across the board, such as other agricultural vehicles, construction vehicles, and industrial vehicles. 
         [0047]    As illustrated in  FIGS. 1 and 2 , the tractor  1  is equipped with various work machines (rotaries and the like) and performs various works. Regarding the tractor  1 , an engine  3 , a hood  7 , a transmission case, a front axle, a rear axle, each of which is not illustrated, a cabin  26 , and a drive operating unit  37  are arranged on a machine body frame  2  of which the longitudinal direction is the back-and-front direction. 
         [0048]    A counterweight  6  and the like are mounted on the front end portion of the machine body frame  2  via a front hitch not illustrated. The engine  3  (see  FIGS. 3 and 4 ) is mounted on approximately the central portion of the machine body frame  2 . The transmission case not illustrated that stores part of a power transmission mechanism of the tractor  1  is coupled with the rear end portion of the machine body frame  2 . Also, the front portion of the machine body frame  2  is supported with a pair of right and left front wheels  4  via the front axle not illustrated. The rear portion of the transmission case is supported with a pair of right and left rear wheels  5  via the rear axle not illustrated. Thus, the tractor  1  is such that the machine body frame  2  and the transmission case are integrally constituted and supported with the front wheels  4  and the rear wheels  5 . 
         [0049]    In the tractor  1 , the hood  7  and the like are arranged in such a manner as to cover the engine  3 , thereby constituting the engine room. Regarding the tractor  1 , a front grille  8  and head lights  10  that light up in front of the tractor  1  are provided in the front of the hood  7 . In the tractor  1 , the drive operating unit  37  in which an operator rides so as to operate the tractor  1  is provided in the rear of the hood  7  and above the transmission case. The tractor  1  is such that the drive operating unit  37  is covered with a cabin  26 . Also, in the tractor  1 , a work machine mounting device not illustrated is provided in back of the transmission case. 
         [0050]    Regarding the tractor  1  constituted in the aforementioned manner, after the power of the engine  3  is shifted by the power transmission mechanism, the power is transmitted to the pair of right and left front wheels  4  and the pair of right and left rear wheels  5  by way of the front axle and the rear axle. The tractor  1  travels by the rotational drive of the pair of right and left front wheels  4  and the pair of right and left rear wheels  5 . Also, regarding the tractor  1 , after the power of the engine  3  is shifted by the power transmission mechanism, the power is also transmitted to work machines such as a cultivator, which is not illustrated but mounted via the work machine mounting device provided in back of the transmission case. 
         [0051]    Next, the counterweight  6 , the hood  7 , the front grille  8 , and side covers  9  will be described referring to  FIG. 1 . 
         [0052]    As illustrated in  FIGS. 1, 3, 4, and 5 , the counterweight  6  balances the weight of the work machine mounted on the work machine mounting device. The counterweight  6  is provided on the front end portion of the tractor  1 . The counterweight  6  is formed in an approximately V shape for which the center in the right-left direction protrudes to the front when viewed from a plane. Also, the upper side surface of the counterweight  6  is formed on an inclined surface that tilts downward to the center in the right-left direction. That is, the counterweight  6  is formed in a V shape when viewed from the front in the advancing direction. 
         [0053]    With this constitution in the aforementioned manner, regarding the tractor  1 , when the hood  7  is opened and closed in such a manner that the rear end of the hood  7  faces the front, the front end portion of the hood  7  and the counterweight  6  do not contact each other (see  FIG. 3 ). 
         [0054]    As illustrated in  FIGS. 9 and 10 , the hood  7  constitutes the engine room in which the engine  3  and the like are arranged. The hood  7  is provided on the machine body frame  2  in which the engine  3  is arranged while the longitudinal direction thereof is regarded as the back-and-front direction, in such a manner as to cover a section leading from the front end portion of the machine body frame  2  to the cabin  26 . An opening portion is formed in the front end of the hood  7 . The front grille  8  is provided in the opening portion of the hood  7 . The hood  7  is configured to rotate upward about the front end portion or the rear end as a fulcrum and make the engine room openable (see a black-painted arrow in  FIG. 3 ). 
         [0055]    The hood  7  is constituted of an upper surface  7   a , an upper left surface  7   b , an upper right surface  7   c , a left surface  7   d , and a right surface  7   e . In the hood  7 , respective surfaces adjacent to each other, out of the upper surface  7   a , the upper left surface  7   b , the upper right surface  7   c , the left surface  7   d , and the right surface  7   e , are integrally formed. 
         [0056]    The upper surface  7   a  is formed in an approximately triangular shape whose vertex is directed to the front when viewed from a plane. The upper surface  7   a  constitutes part of the hood  7  in which the vertex is positioned approximately at the center in the back-forth direction of the hood  7  from the rear end of the hood  7 . The upper surface  7   a  is formed on an inclined surface that tilts downward from the rear end to the front end of the hood  7 . 
         [0057]    The upper left surface  7   b  constitutes part of the hood  7  leading from the rear end of the hood  7 , which is the left side of the upper surface  7   a , to the front end of the hood  7 . The upper right surface  7   c  constitutes part of the hood  7  leading from the rear end of the hood  7 , which is the right side of the upper surface  7   a , to the front end of the hood  7 . Part of the hood  7 , which is constituted of the upper left surface  7   b  and the upper right surface  7   c , is formed such that the width in the right-left direction gradually increases from the rear end to the front end of the hood  7 , and the width in the right-left direction is gradually reduced from a midway portion. Then, the hood  7  is formed in an approximately shell shape in which a left-side ridge line and a right-side ridge line converge at the center of the front end when viewed from a plane. 
         [0058]    The upper left surface  7   b  and the upper right surface  7   c  are constituted in such a manner as to be abutted to the upper surface  7   a , leading from the rear end of the hood  7  to the vertex of the upper surface  7   a . Then, the upper left surface  7   b  and the upper right surface  7   c  are constituted in such a manner as to be abutted to each other in the center in the right-left direction of the hood  7 , leading from the vertex of the upper surface  7   a  to the front end of the hood  7 . The upper left surface  7   b  is formed on an inclined surface that tilts downward to the left. The upper right surface  7   c  is formed on an inclined surface that tilts downward to the right. In addition, the upper left surface  7   b  and the upper right surface  7   c  are is formed on an inclined surface that tilts downward from the vertex of the upper surface  7   a  to the front end of the hood  7 . Accordingly, part of the hood  7 , which is constituted of the upper surface  7   a , the upper left surface  7   b , and the upper right surface  7   c , is constituted such that the heights from the ground are reduced from the rear end to the front end, and from the center in the right-left direction to the right and left respectively. 
         [0059]    The left surface  7   d  constitutes part of the hood  7  in such a manner as to be abutted to the left-side end of the upper left surface  7   b  and face the machine body frame  2 . The right surface  7   e  constitutes part of the hood  7  in such a manner as to be abutted to the right-side end of the upper right surface  7   c  and face the machine body frame  2 . Discharge ports for cooling air that cools the engine  3  are formed in the left surface  7   d  and the right surface  7   e . Notches facing the rear end of the hood  7  are formed at the upper end of the front end portion of the left surface  7   d  and the upper end of the front end portion of the right surface  7   e . In this manner, a notch portion  7   f  made up of the lower end of the upper left surface  7   b  and the notch of the left surface  7   d  is constituted on the left side of the front end portion of the hood  7 . Also, a notch portion  7   g  made up of the lower end of the upper right surface  7   c  and the notch of the right surface  7   e  is constituted on the right side of the front end portion of the hood  7 . 
         [0060]    An instrumental panel  38  is connected to the rear end of the hood  7 . The shape made up of the upper surface  7   a , the upper left surface  7   b , the upper right surface  7   c , the left surface  7   d , and the rear end of the right surface  7   e  of the hood  7  is formed approximately similarly to the shape of the front end of the instrumental panel  38 . That is, the instrumental panel  38  is successively connected to the hood  7  without steps. Also, regarding the instrumental panel  38 , an inclined surface  38   a  that tilts downward from the connection end with the hood  7  to the drive operating unit  37  in the cabin  26  is formed. That is, the instrumental panel  38  is constituted in such a manner that the height from the ground is not higher than that of the hood  7 . 
         [0061]    Regarding the tractor  1 , as the hood  7  becomes closer to the operator, the field of vision in front of the operator (including the left-side front and the right-side front) is blocked by the hood  7 , which causes blind spots. That is, regarding the tractor  1 , as the height of the hood  7  from the ground increases with respect to the height of the operator from the ground, the blind spots appear in the field of vision in front of the operator (hereinafter referred to as the height of each portion from the ground with respect to the height of the operator from the ground). 
         [0062]    As illustrated in  FIG. 11A , a tractor  100  having a conventional hood shape that is not formed in a shell shape viewed from a plane is constituted such that both right and left ends of the front of the hood are the same height as that of the center of the front end portion of the hood when viewed from an operator. Accordingly, a blind spot B of the tractor  100  includes blind spots that are caused by the both right and left ends in front of the hood. 
         [0063]    As illustrated in  FIG. 11B , the tractor  1  of the present embodiment is constituted in such a manner that the height of hood  7  from the ground is reduced as it advances from the front end of the hood  7  and the center in the right-left direction of the hood  7  to the right and left. Also, regarding the tractor  1 , the height of both right and left ends of the front end of the hood  7  is lower than that of the center of the front end portion of the hood. Also, regarding the tractor  1 , the height of the instrumental panel  38  from the ground is not higher than that of the hood  7 . Accordingly, a blind spot A of the tractor  1  does not include a blind spot caused by both right and left ends of the front of the hood  7  and a blind spot caused by the instrumental panel  38 . That is, in the blind spot A of the tractor  1 , the blind spots that occur in the left-side front and the right-side front are decreased, compared with the blind spot B of the tractor  100 . 
         [0064]    With the constitution in the aforementioned manner, regarding the tractor  1 , a proportion of the hood  7  to the field of vision in front, left-side front, and right-side front of the operator is decreased. Also, regarding the tractor  1 , the proportion of the hood  7  to the field of vision in left-side front and in right-side front of the operator is decreased. Furthermore, regarding the tractor  1 , a proportion of the instrumental panel  38  that occupies the field of vision in front of the operator is decreased. Consequently, the tractor  1  can decrease the blind spots that occur in front thereof. 
         [0065]    As illustrated in  FIG. 12 , the front grille  8  covers a supply port through which the cooling air is taken out for the engine  3  and the like from the outside into the engine room. The front grille  8  is provided at an opening portion, which is a supply port formed in the front end portion of the hood  7 . The front grille  8  is constituted of resin or metal. A plurality of long holes  8   a  for which the longitudinal direction is the right-left direction are formed in the front grille  8 . 
         [0066]    With the constitution in the aforementioned manner, a proportion of areas of the holes of the front grille  8  per unit area increases, compared with the case where a plurality of round holes are formed. Accordingly, the tractor  1  can decrease resistance in the case where outside air passes through the front grille  8 , compared with the case where the plurality of round holes are formed. 
         [0067]    As illustrated in  FIG. 9 , the side covers  9  cover sections between the hood  7  on both right and left sides and the machine body frame  2 . The side cover  9  is constituted of an upper side cover  9   a  and a lower side cover  9   b . The upper side cover  9   a  is constituted of a reticular member and provided in such a manner as to cover a section ranging from the front wheels  4  to the cabin  26 , on the lower side of the left surface  7   d  and the right surface  7   e  of the hood  7 . The lower side cover  9   b  is provided in such a manner as to cover the machine body frame  2  on the lower side of the respective upper side covers  9   a  of the left surface  7   d  and the right surface  7   e . The upper side cover  9   a  and the lower side cover  9   b  are fixed on the machine body frame  2 . 
         [0068]    With the constitution in the aforementioned manner, regarding the tractor  1 , various apparatuses with regard to the engine  3  or the like that is not covered with the hood  7 , and the machine body frame  2  are covered with the side cover  9  from the outside. Accordingly, the tractor  1  can prevent dirt raised by the front wheels  4  during travelling from intruding into the machine body frame  2  or the interior of the engine room by means of the side covers  9  while releasing heat in the engine room from the upper side covers  9   a  to the outside. In addition, the tractor  1  can release the heat in the engine room from the upper side covers  9   a  to the outside or take in fresh air of the outside into the engine room. 
         [0069]    Next, the head lights  10  will be described referring to  FIGS. 1, 3 to 5, 7, and 13 to 15 . 
         [0070]    As illustrated in  FIGS. 1, 3 to 5, and 7 , the head lights  10  light up in front of the tractor  1 . The head lights  10  are provided on the left-side end and the right-side end of the front end portion of the hood  7 . Specifically, the head lights  10  on both right and left sides are provided in the notch portions  7   f  and  7   g  that are constituted on the right side and left side of the front end portion of the hood  7 . The head light  10  includes a case  11 , a reflector  12 , a bulb  13 , an LED flasher  14 , and a head light cover  15 . The head lights are configured to light up with side-marker lights  19  described later. That is, the tractor  1  is configured such that the head lights  10  light up after the side-marker lights  19  light up. 
         [0071]    As illustrated in  FIGS. 13 to 15 , the case  11  is a main constituent member of the head light  10 , wherein the reflector  12 , the bulb  13 , the LED flasher  14 , and the head light cover  15  are mounted. The case  11  is formed in an approximately triangular pyramid, which is mountable on the notch portions  7   f  and  7   g  of the hood  7  respectively. Also, the case  11  is formed in such a manner that the end surface on the large-diameter side, which is a base of the approximately triangular pyramid, is opened. That is, a concave portion  11   a  for mounting the reflector  12 , the bulb  13 , or the like is formed in the case  11  while the end surface on the large-diameter side is regarded as the front end surface of the case  11 . 
         [0072]    The cases  11  on the right and left are such that the concave portions  11   a  formed on the front end surface are respectively directed to the front of the tractor  1  and assembled into the notch portions  7   f  and  7   g . In this time, the cases  11  on the right and left are arranged such that, out of three vertices of the front end surface, which is the base of the approximately triangular pyramid, a first vertex  11   d  is directed to the center in the right-left direction of the hood  7 , and a second vertex  11   e  is directed to an outer side in the right-left direction of the hood  7 . Also, the cases  11  on the right and left are assembled into the hood  7  in such a manner that an interval between the left-side surface of the case  11  on the left side and the right-side surface of the case  11  on the right side is approximately the same with the maximum width in the right-left direction of the hood  7 . 
         [0073]    The cases  11  on the right and left are configured in such a manner that the vertex (the first vertex  11   d ) on the central side in the right-left direction of the hood  7  on the front end surface protrudes to the front end of the hood  7 , with respect to the vertex (the second vertex  11   e ) on the outer side in the right-left direction of the hood  7 . That is, the front end surfaces of the cases  11  on the right and left are formed in such a manner as to protrude to the front as they advance from the outer side in the right-left direction of the hood  7  to the central side in the right-left direction of the hood  7  when viewed from a plane. That is, the case  11  on the left side is formed in a shape that the front end surface thereof can be visually recognized form the left of the tractor  1 , and the case  11  on the right side is formed in a shape that the front end surface thereof can be visually recognized from the right of the tractor  1 . 
         [0074]    Reflectors  11   b  that condense light on the outside and reflect the light are provided on the left-side surface of the case  11  on the left side and on the right-side surface of the case  11  on the right side. It is noted that a slit  11   c  through which the light from the bulb  13  penetrates may be formed in the cases  11 , in place of the reflector  11   b.    
         [0075]    The reflector  12  reflects the light of the bulb  13  as a reflection means. The reflector  12  is formed in an approximately dome shape in which the light of the bulb  13  arranged approximately in its center is reflected in a constant direction. The reflectors  12  are respectively assembled in the concave portions  11   a  of the cases  11  on the right and left in such a manner that the light is reflected to the front of the tractor  1 . Specifically, the reflectors  12  are constituted in an approximately dome shape on the outer sides in the right-left direction of the hood  7  of the cases  11  and constituted leading from a portion constituted in an approximately dome shape to the end portion on the central side in the right-left direction of the hood  7  with regard to the cases  11 . 
         [0076]    The bulb  13  generates light as a main light source body. The bulb  13  is constituted of light sources of arbitrary types such halogen lamps and HID lamps. The bulb  13  is assembled in a predetermined position approximately in the center of the reflector  12  constituted in an approximately dome shape. Accordingly, the greater part of the light generated from bulb  13  is irradiated to the front of the tractor  1  by the reflectors  12 . In contrast, part of the light generated from bulb  13  is irradiated in the right-left direction of the tractor  1  by the reflectors  12  provided in or before reaching the end portion on the central side in the right-left direction of the hood  7  of the case  11 . 
         [0077]    The LED flasher  14  generates light as an auxiliary light source body. The LED flasher  14  is constituted of a plurality of LEDs. The LED flasher  14  is provided in such a manner that respective LEDs are arranged side by side in a row on the front end surfaces of the cases  11  on the right and left. That is, the LED flasher  14  is such that the LEDs are arranged facing the center in the right-left direction of the front end from the outer sides in the right-left direction of the hood  7 . Accordingly, the LED flasher  14  can be visually recognized not only from the front of the tractor  1  but also from the right and left (see  FIG. 15 ). The LED flashers  14  are constituted in such a manner as to light up in combination with the side-marker lights  19  described later when the side-marker lights  19  light up. It is noted that, in the present embodiment, the LED flasher  14  is constituted of the plurality of LEDs, but may be constituted of other light sources. 
         [0078]    The head light cover  15  protects the reflector  12 , the bulb  13 , and the LED flasher  14  in the case  11 . The head light cover  15  is constituted of materials through which the light of the bulb  13  and the LED flasher  14  penetrate. The head light covers  15  are respectively provided on the front end surfaces of the cases  11  on the right and left in such a manner as to cover the reflector  12 , which is arranged in the concave portion  11   a  of the case  11 , the bulb  13 , and the LED flasher  14  (see hatching sections in  FIGS. 13 and 14 ). 
         [0079]    With this constitution in the aforementioned manner, the tractor  1  irradiates the light to the front, the right, and the left by means of the reflection of light from the bulbs  13  by the reflectors  12 , the reflection of light on the outside by the reflectors  11   b  of the cases  11  or the transmissive light from the slits  11   c  of the bulbs  13 , and the LED flasher  14  provided on the front end surface of the cases  11  while irradiating the light in the advancing direction by the bulbs  13 , which are the main light source bodies of the head lights  10  on the right and left. Also, the reflection of the light of the bulbs  13  by the reflectors  12  from the front end surfaces of the head lights  10 , which are visually recognizable from the lateral directions of the tractor  1 , is not blocked by the hood  7  thanks to the notch portions  7   f  and  7   g  formed in the hood  7 . Accordingly, visibility from the front, the right, and the left of the tractor  1  can be improved. 
         [0080]    Next, side view mirrors  16  and front working lights  22  will be described referring to  FIGS. 1, 3, 4, 7, 8, and 16 to 19 . 
         [0081]    As illustrated in  FIGS. 1, 3, 4, 7, 8, and 16 , the side view mirrors  16  are used to visually recognize the rear of the tractor  1 . The right and left side view mirrors  16  are respectively provided on the bilateral ends of the upper portion of the front side surface  26   b  of the cabin  26 . The side view mirror  16  includes a support arm  17 , the front working light  22 , a mirror portion  18 , and the side-marker light  19 . 
         [0082]    The right and left support arms  17  support the mirror portions  18  and the side-marker lights  19 . The support arm  17  is constituted of a rectangular bar-shaped member when viewed from a cross section vertical to the axial direction thereof. The support arm  17  is formed in an approximately L shape having a bending portion  17   a  in the midway portion. The lateral ends of the long side portions of the support arms  17  are respectively fixed on the bilateral ends of the upper portions of the front side surface  26   b  of the cabin  26 . 
         [0083]    The support arm  17  is formed in such a manner that a cross-sectional area Ar of the rectangular cross section is reduced when viewed from a cross section vertical to the axial direction thereof, as it advances from one lateral end to the lateral end (other lateral end) of the short side portion, on which the mirror portion  18  is supported. That is, the support arm  17  is configured in such a manner that weight per unit length is reduced as it advances from one lateral end fixed to the cabin  26  to the other lateral end. Furthermore, the support arm  17  is integrally formed with a beam  17   b  that couples one end and the other end in such a manner as to straddle over the bending portion  17   a . Accordingly, regarding the support arm  17 , while the rigidity of one lateral end portion and the rigidity of the bending portion  17   a  are secured, the weight of the other lateral end portion is reduced, so that the vibration of the other lateral end is suppressed. 
         [0084]    The left support arm  17  is provided in such a manner that the long side portion thereof faces from the front side surface  26   b  to the left-side front. The left support arm  17  is provided in such a manner that the long side portion thereof faces from the front side surface  26   b  to the right-side front. Also, the support arms  17  on both right and left sides are provided in such a manner that the short side portions thereof face downward from the bending portion  17   a . Specifically, the support arms  17  are constituted such that a position in the back-forth direction of the bending portion  17   a  is placed in the vicinity of the rear end of the hood  7  (see  FIGS. 3 and 4 ), and a position in the right-left direction of the bending portion  17   a  is placed in an approximate center of the width of the rear wheels  5  (see  FIG. 5 ), and a position of height of the bending portion  17   a  is placed in the vicinity of a ceiling  26   f  of the cabin  26  (see  FIGS. 3 and 4 ). That is, the support arms  17  are constituted such that the mirror portions  18  are arranged at position separated from the cabin  26  (drive operating unit  37 ) to the front on both right and left sides. 
         [0085]    The mirror portions  18  hold mirrors. Regarding the mirror portions  18 , a mirror  18   b  is provided in the interior of a box-shaped case  18   a  having an opening portion. The mirror portions  18  are constituted such that the mirror  18   b  is provided in the opening portion of the case  18   a , and the reflection surface of the mirror  18   b  can be visually recognized from the outside. The mirror portions  18  are connected to the short-side lateral end of the support arm  17  while the reflection surface of the mirror  18   b  faces the rear of the tractor  1 . That is, the mirror portions  18  are arranged at position indicating the approximate width and height of the tractor  1 . The mirror portions  18  are constituted such that the reflection surface of the mirror  18   b  can face in an arbitrary direction with respect to the support arm  17 . 
         [0086]    The side-marker light  19  are used to visually recognize the width of the tractor  1 . The side-marker light  19  are constituted of a plurality of LEDs. The side-marker light  19  are respectively provided in the cases  18   a  of right and left mirror portions  18  and on the surface (back surface) opposite to the opening portion. That is, the side-marker lights  19  are configured to light up to the front of the tractor  1  on the opposite side respect to the reflection surface of the mirrors  18   b  of the mirror portions  18  facing the rear of the tractor  1 . The side-marker light  19  are provided at the mirror portions  18  on both right and left sides, so that the approximate width and height of the tractor  1  can be indicated. Also, the side-marker lights  19  can be used as a direction indicator by blinking one of right and left side-marker lights  19 . 
         [0087]    With this constitution in the aforementioned manner, regarding the tractor  1 , the mirror portions  18  are arranged at positions of being disposed in front of the cabin  26  on both right and left sides and separated above the cabin  26 . Accordingly, the tractor  1  can simultaneously represent the width and height of the tractor  1  while securing the field of vision in the rear. 
         [0088]    The side-marker lights  19  are such that the plurality of LEDs are arranged in an arbitrary mode in the mirror portions  18 . Specifically, the side-marker lights  19 , which are the first embodiment of the side-marker light, are constituted such that the plurality of LEDs are arranged side by side in the up-down direction on the rear surfaces of the cases  18   a  of the mirror portions  18 . Then, as illustrated in  FIG. 18A , the side-marker lights  19  are formed in a spherical-surface shape smoothly expanded to the front of the tractor  1  on the rear surfaces of the cases  18   a , so that the irradiation direction of each LED can be diffused in the up-down direction. 
         [0089]    Also, as illustrated in  FIG. 17 , as another embodiment of the side-marker light  19 , the side-marker light  19  may be provided in the vicinity of the bending portion  17   a  of the support arm  17 . Specifically, the side-marker light  19  is mounted by use of a surface that is constituted of the bending portion  17   a  and beam  17   b  of the support arm  17 . 
         [0090]    With this constitution in the aforementioned manner, regarding the tractor  1 , the side-marker light  19  always lights up in a constant direction and at a constant position irrespective of the direction of the mirror portions  18 . Accordingly, the tractor  1  can simultaneously represent the width and height while securing the field of vision in the rear. 
         [0091]    Also, as illustrated in  FIG. 18B , side-marker lights  20 , which are the second embodiment of the side-marker light, are constituted such that the plurality of LEDs are arranged side by side in the right-left direction on the rear surfaces of the cases  18   a  of the mirror portions  18 . Then, the side-marker lights  20  are formed in a spherical-surface shape smoothly expanded to the front of the tractor  1  on the rear surfaces of the cases  18   a , so that the irradiation direction of each LED can be diffused in the right-left direction. 
         [0092]    Also, as illustrated in  FIG. 18C , side-marker lights  21 , which are the third embodiment of the side-marker light, are constituted such that the plurality of LEDs are arranged side by side in the up-down direction and the right-left direction on the rear surfaces of the cases  18   a  of the mirror portions  18 . The side-marker lights  21  are formed in a spherical-surface shape smoothly expanded to the front of the tractor  1  on the rear surfaces of the cases  18   a , so that the irradiation direction of each LED can be diffused in the up-down direction and the right-left direction. 
         [0093]    With this constitution in the aforementioned manner, regarding the tractor  1 , the irradiation direction of the side-marker lights  19  are set based on the shape of the case  18   a  of the mirror portion  18  and the arrangement of the side-marker lights  19 . Accordingly, the tractor  1  can simultaneously represent the width and height while securing the field of vision in the rear. 
         [0094]    As illustrated in  FIGS. 1, 3, 4, 7, 16 and 19 , the front working lights  22  light up in front of the tractor  1 . The front working lights  22  are respectively provided on one side end portion (the lateral end portion of the long-side portion) of the right and left support arms  17 . The front working light  22  includes an upper working light  23 , a lower working light  24 , and a front working light cover  25 . 
         [0095]    Regarding the front working light  22 , the upper working light  23  and the lower working light  24  are arranged side by side in the up-down direction on the lower side of the one side end portion of the support arm  17 . The front working light cover  25  is formed of a material through which the light from the upper working light  23  and the lower working light  24  penetrates. The front working light cover  25  is constituted in such a manner as to cover the upper working light  23  and the lower working light  24  and couple the lower side surface of the support arm  17  with the front side surface  26   b  of the cabin  26  (see a hatching section in  FIG. 16 ). That is, the front working light cover  25  protects the upper working light  23  and the lower working light  24  and improves the rigidity of the support arm  17 . Accordingly, regarding the support arm  17 , the rigidity of the one side end portion is further improved, thereby suppressing vibration. 
         [0096]    The front working light  22  is constituted such that the upper working light  23  and the lower working light  24  respectively illuminate an arbitrary range. For example, as illustrated in a white-painted arrow in  FIG. 16  and  FIG. 19 , the right and left front working lights  22  are constituted in such a manner that the upper working lights  23  illuminate irradiation ranges C respectively, which are the left-side front and the right-side front of the tractor  1  and that the right and left lower working lights  24  illuminate an irradiation range D, which is the front of the tractor  1 . Also, the right and left front working lights  22  may be constituted in such a manner that the upper working lights  23  illuminate the irradiation range D, which is the front of the tractor  1  and that the right and left lower working lights  24  illuminate the irradiation ranges C, which are the left-side front and the right-side front of the tractor  1 . 
         [0097]    With this constitution in the aforementioned manner, regarding the tractor  1 , the irradiation ranges of the front working lights  22  are set in such a manner as not to include the side view mirrors  16  in the irradiation ranges. Also, regarding the tractor  1 , the support arms  17  of the side view mirrors  16  is reinforced by the front working lights  22 . Accordingly, the tractor  1  can improve the visual recognizability of the side-marker lights  19  while irradiating light in a wide range by means of the front working lights. 
         [0098]    Next, the cabin  26  and rear working lights  28  will be described referring to  FIGS. 1, 2, and 20 to 23 . 
         [0099]    As illustrated in  FIGS. 1, 2, 20, and 21 , the cabin  26  covers the drive operating unit  37 . The cabin  26  is constituted in an approximately box shape formed by the front side surface  26   b , a left side door  26   c , a right side door  26   d , a rear side surface  26   e , and the ceiling  26   f  with a cabin frame  26   a . An air-conditioner unit  27  and rear working lights  28  are included in the cabin  26 . 
         [0100]    Regarding the cabin  26 , a frame body of the left side door  26   c  and the frame body of the right side door  26   d , which are integrally formed, are fixed on the machine body frame  2 , thereby constituting the frame  26   a . That is, regarding the cabin  26 , the frame bodies on both right and left sides of the front side surface  26   b , the frame bodies on both right and left sides of the rear side surface  26   e , and the frame bodies on both right and left sides of the ceiling  26   f  are integrally constituted as the frame body of the left side door  26   c  and the frame body of the right side door  26   d  respectively. Accordingly, regarding the cabin  26 , the front side surface  26   b , the rear side surface  26   e , and the ceiling  26   f  are integrally constituted. 
         [0101]    The front side surface  26   b  of the cabin  26  is constituted in front of the drive operating unit  37  via the cabin frame  26   a . Curved surface glass (or resin, specifically, polycarbonate, acryl, or the like) that cover a section from the floor surface of the drive operating unit  37  to the ceiling  26   f  of the cabin  26  is provided as a windshield on the front side surface  26   b . The curved surface glass constituting the front side surface  26   b  is formed in such a manner as to bend in a smooth arc shape in the right-left direction as the axial direction and in a smooth arc shape in the up-down direction as the axial direction (see a white-painted arrow in  FIG. 20 ). That is, the front side surface  26   b  is constituted of the curved surface glass formed in an approximately spherical-surface shape expanded in the front direction. A notch portion for arranging the instrumental panel  38  in the central portion in the right-left direction is formed on the curved surface glass of the front side surface  26   b.    
         [0102]    The left side door  26   c  and the right side door  26   d , which can open and close the entire surface of the cabin  26 , are respectively provided with the cabin frame  26   a  as the frame body on both right and left lateral surfaces of the cabin  26 . The entire surfaces of the left side door  26   c  and the right side door  26   d  are constituted of the curved surface glass (or resin, specifically, polycarbonate, acryl, or the like) bent in a smooth arc shape in the up-down direction as the axial direction (see the white-painted arrow in  FIG. 20 ). The rear end portions of the left side door  26   c  and the right side door  26   d  are connected to the cabin frame  26   a  via hinges  26   g.    
         [0103]    External handles  26   h  are provided on the front end portions of the left side door  26   c  and the right side door  26   d . Reinforcing bars  26   j  are provided on the left side door  26   c  and the right side door  26   d . The reinforcing bars  26   j  are constituted of a plate-shaped member. The reinforcing bar  26   j  couples the hinge  26   g  with the external handle  26   h  on the side of the drive operating unit  37  in the up-down direction as a plate-width direction. Inner-side handles  26   k  that are used in opening and closing the left side door  26   c  and the right side door  26   d  are formed on the reinforcing bars  26   j . It is formed such that the inner-side handle  26   k  branches in such a manner as to protrude from the midway portion on the side of the hinge  26   g  of the reinforcing bar  26   j  to the side of the drive operating unit  37  (operating seat  42 ). The inner-side handle  26   k  is formed until the inner-side handle  26   k  leads to the external handle  26   h  in parallel with the reinforcing bar  26   j  (see  FIG. 28 ). 
         [0104]    The rear side surface  26   e  of the cabin  26  is constituted in back of the drive operating unit  37  via the cabin frame  26   a . The curved surface glass (or resin, specifically, polycarbonate, acryl, or the like) that covers a section from the vicinity of the seating surface of the operating seat  42  of the drive operating unit  37  to the ceiling  26   f  of the cabin  26  is provided as rear glass on the rear side surface  26   e . The curved surface glass constituting the rear side surface  26   e  is formed in such a manner that the both right and left end portions thereof are bent, so as to continuously connect the left side door  26   c  and the right side door  26   d.    
         [0105]    The ceiling  26   f  of the cabin  26  is constituted on the upper end portions of the front side surface  26   b , the left side door  26   c , the right side door  26   d , and the rear side surface  26   e  via the cabin frame  26   a . Curved surface glass  26   m  (or resin, specifically, polycarbonate, acryl, or the like) that covers a section from the front end of the ceiling  26   f  to a position corresponding to the upper section of the operating seat  42  of the drive operating unit  37  is provided on the ceiling  26   f . The curved surface glass  26   m  constituting the ceiling  26   f  is bent and formed in such a manner as to continuously connect the front side surface  26   b . With this constitution in the aforementioned manner, the forward field of vision is secured, which makes it easy to visually recognize a work machine hoisted in loading work and the like and improves workability. 
         [0106]    The ceiling  26   f  is formed in a curved shape from the front end to the rear end thereof as a whole. The radius of curvature of the curved shape of the ceiling  26   f  increases as the ceiling  26   f  advances to the rear end in such a manner that the radius of curvature is varied from a radius R 1  of curvature in the vicinity of the front end of the ceiling  26   f  to a radius R 2  of curvature in the vicinity of the rear end of the ceiling  26   f . That is, the ceiling  26   f  is constituted in an arc shape that approximates a clothoid curve represented by the following mathematical expression with a radius R of curvature and a length L of a curved line. 
         [0000]      Mathematical Expression: RL= A   2 ( A : Clothoid Parameter) 
         [0107]    Accordingly, the ceiling  26   f  can be constituted in such a manner that the height from the ground gently increases as the ceiling  26   f  advances to the rear end thereof. That is, it is constituted such that the thickness of the ceiling  26   f  increases in such a manner as to change from a thickness H 1  in the vicinity of the front end of the ceiling  26   f  to a thickness H 2  in the vicinity of the rear end of the ceiling  26   f  as the ceiling  26   f  advances to the rear end (see  FIG. 21 ). Furthermore, an eaves portion  26   n , wherein only the upper end of the rear end surface of the ceiling  26   f  protrudes to the rear with respect to the rear side surface  26   e  of the cabin  26 , is formed on the ceiling  26   f.    
         [0108]    The air-conditioner unit  27  is provided in the interior of the ceiling  26   f , ranging from the rear end of the curved surface glass  26   m  to the rear end of the ceiling  26   f . As illustrated in  FIG. 22 , an introducing port  26   p , through which the air-conditioner unit  27  takes in outside air, is provided in the eaves portion  26   n  of the rear end of the ceiling  26   f . A louver is provided in the introducing port  26   p . Accordingly, the tractor  1  can include the air-conditioner unit  27  in the interior of the ceiling  26   f  without causing part of the ceiling  26   f  to protrude or forming the introducing port separately. 
         [0109]    With this constitution in the aforementioned manner, the tractor  1  is constituted of the curved surface glass or resin except for the cabin frame  26   a  and the rear portion of the ceiling  26   f . Also, regarding the tractor  1 , the visibility and rigidity of the cabin  26  are improved with monocoque structure in which the frame  26   a  integrally formed is successively coupled with the curved surface glass. Regarding the tractor  1 , the opening and closing of the left side door  26   c  and the right side door  26   d  are facilitated, and the left side door  26   c  and the right side door  26   d  are reinforced with the reinforcing bars  26   j . Accordingly, regarding the tractor  1 , the front side surface  26   b , the left side door  26   c , the right side door  26   d , the rear side surface  26   e , and the ceiling  26   f  of the cabin  26  can be constituted of glass. 
         [0110]    Also, regarding the tractor  1 , the thickness of the ceiling  26   f  of the cabin  26  successively increases from the ceiling  26   f  of the cabin  26  to the rear end. Accordingly, the air-conditioner unit can be provided in the interior of the ceiling  26   f  without causing part of the ceiling  26   f  to protrude or separately forming the introducing port, through which the air-conditioner unit  27  takes in the outside air. 
         [0111]    As illustrated in  FIGS. 2, 21, and 22 , the rear working lights  28  illuminate the rear of the tractor  1 . The right and left rear working lights  28  are respectively provided both side end portions of the inclined surface of the rear end of the ceiling  26   f . The introducing port  26   p  of the air-conditioner unit  27  is formed between the right and left rear working lights  28 . The rear working light  28  includes an external working light  29  and an internal working light  30 . 
         [0112]    As illustrated in  FIGS. 22 and 23 , regarding the rear working light  28 , the external working light  29  and the internal working light  30  are arranged side by side in the right-left direction in the eaves portion  26   n  of the rear end of the ceiling  26   f . The rear working lights  28  are covered with rear working light covers  28   a  (see a hatching portion in  FIG. 22 ) formed of a material through which the light from the external working light  29  and the internal working light  30  penetrate. The external working light  29  and the internal working light  30  are provided in such a manner as to face the rear via the eaves portion  26   n  from the interior of the ceiling  26   f , so as not to protrude with respect to the eaves portion  26   n . Accordingly, regarding the rear working lights  28 , the rear working light covers  28   a  are provided in such a manner as to be flush with the eaves portion  26   n.    
         [0113]    The rear working lights  28  are constituted such that the external working light  29  and the internal working light  30  respectively illuminate an arbitrary range. For example, the rear working lights  28  are constituted such that the right and left external working lights  29  illuminate the rears E of the tractor  1 , and the right and left internal working lights  30  illuminate the right and left rears F of the tractor  1  respectively (see white-painted arrows in  FIG. 22 ). Also, the rear working lights  28  may be constituted such that the right and left external working lights  29  illuminate the right and left rears F of the tractor  1 , and the right and left internal working lights  30  illuminate the rears E of the tractor  1 . 
         [0114]    With this constitution in the aforementioned manner, regarding the tractor  1 , the rear working lights  28  (the external working lights  29  and the internal working lights  30 ) are provided in such a manner as to face the rear from the interior of the ceiling  26   f  of the cabin  26 , and the irradiation ranges of the external working lights  29  and the internal working lights  30  are set. Accordingly, a wide range can be irradiated by the rear working lights  28  without causing the rear working lights  28  to protrude from the cabin  26 . 
         [0115]    Next, fenders  31 , steps  32 , and combination lamps  33  will be described referring to  FIGS. 1 to 4 and 24 to 27 . 
         [0116]    As illustrated in  FIGS. 1 to 4, and 24 , the fenders  31  prevent dirt raised by the rotation of the rear wheels  5  from scattering. The fenders  31  are provided on both right and left sides of the cabin  26  in such a manner as to cover the tread surfaces (surfaces in contact with the ground) of the rear wheels  5  on the both right and left sides. Specifically, the fenders  31  are provided along the tread surfaces of the rear wheels  5  from the vicinity of the rear side surface  26   e  of the cabin  26  to the vicinity of the machine body frame  2 . Also, the fenders  31  are constituted in such a manner that the central side in the right-left direction of the tractor  1  is abutted to the operating seat  42  in the cabin  26 . That is, the right and left fenders  31  are arranged in the tractor  1  in such a manner as to sandwich the operating seat  42 . The fenders  31  are integrally formed on the outside and inside of the cabin  26 . 
         [0117]    The steps  32  are connected to the front ends (the side of the machine body frame  2 ) of the fenders  31 . Inclined surfaces  31   a  that tilt downward are formed on the rear ends (the side of t rear side surface  26   e  of the cabin  26 ) of the fenders  31 . Then, the combination lamps  33  are provided on the inclined surfaces  31   a  of the fenders  31 . 
         [0118]    As illustrated in  FIGS. 1 to 4, 24, and 25 , when an operator gets into the cabin  26 , the step  32  is treaded by the leg G of the operator. The steps  32  are respectively provided in front of the rear wheels  5  and in the vicinity of the left side door  26   c  and the right side door  26   d  of the cabin  26 . The step  32  is constituted of a front support portion  32   a , a receiving portion  32   b , and a rear support portion  32   c.    
         [0119]    The front support portion  32   a  supports the front of the receiving portion  32   a . One end of the front support portion  32   a  is coupled with the cabin frame  26   a  in the vicinity of the floor of the drive operating unit  37 . The other end of the front support portion  32   a  is formed in such a manner as to lead from the cabin frame  26   a  to the front with respect to the front side surface  26   b  of the cabin  26 . Then, the other end of the front support portion  32   a  is coupled with the receiving portion  32   b  at a predetermined position of which the height is lower than that of the shaft of the rear wheels  5 . That is, the front support portion  32   a  is formed in such a manner as to extend obliquely downward from the cabin frame  26   a  to the front. Also, the other end of the front support portion  32   a  is coupled with the lateral surface on the side of the tractor  1 . That is, the front support portion  32   a  is coupled with the receiving portion  32   b  in such a manner that the front end of the receiving portion  32   b  is released. 
         [0120]    The rear support portion  32   c  support the rear of the receiving portion  32   a . The rear support portion  32   c  is coupled with the front end of the fender  31 . The rear support portion  32   c  has approximately the same width as the width in the right-left direction on the outer side with respect to the cabin  26  of the front end of the fender  31  and is formed along the tread surface of the rear wheel  5  from the front end of the fender  31 . Then, the rear support portion  32   c  is coupled with the receiving portion  32   b  at a predetermined position of which the height is lower than that of the shaft of the rear wheels  5 . That is, the rear support portion  32   c  is formed in such a manner as to successively extend from the front end of the fender  31  to the rear with respect to the front end of the fender  31  while having the same radius R 3  of curvature as that of the fender  31 . 
         [0121]    The receiving portion  32   b  is treaded by the leg G of the operator. The front and rear end portions of the receiving portion  32   b  are integrally coupled with the front support portion  32   a  and the rear support portion  32   c . The receiving portion  32   b  is connected with the front support portion  32   a  forward with respect to the front side surface  26   b  of the cabin  26  and coupled with the fender  31  rearward with respect to the front end of the fender  31 . Also, the receiving portion  32   b  is formed in the same width in the right-left direction as the width of the rear support portion  32   c  in the right-left direction. That is, the receiving portion  32   b  is formed with approximately the same width as the width in the right-left direction on the outer side with respect to the cabin  26  of the front end of the fender  31 . 
         [0122]    A plurality of triangular punch-out holes  32   d  are formed on the surface of the receiving portion  32   b  treaded by the leg G of the operator. The punch-out holes  32   d  are arranged in such a manner that each side is not in parallel to the right-left direction of the receiving portion  32   a . Also, the punch-out holes  32   d  are formed in such a manner that the sides of the adjacent punch-out holes  32   d  are in parallel to each other. That is, a beam-shaped portion between the punch-out holes  32   d  of the receiving portion  32   b  is formed in the oblique direction with respect to the longitudinal direction of the leg G of the operator who gets on or off. 
         [0123]    With this constitution in the aforementioned manner, regarding the tractor  1 , the width of the receiving portion  32   b  of the step  32  is formed wider than the width of the right and left doors in the neighborhood of the floor of the cabin. Regarding the tractor  1 , the front support portion  32   a  of the step  32  is coupled with the receiving portion  32   b  on the side of the tractor  1 , so that the range, in which the leg G of the operator is laid, is not limited by the front support portion  32   a . Also, regarding the tractor  1 , the rear support portion  32   c  of the step  32  is successively formed with fender  31 , so that the leg G of the operator does not contact the front end of the fender  31 . Furthermore, the lateral direction of the leg G of the operator is supported by a crosspiece. Accordingly, the steps  32  can expand the surface of the receiving portion  32   b  treaded by the leg G of the operator and improve the stability of the leg G and convenience when the operator gets on or off. 
         [0124]    As illustrated in  FIGS. 2, 8, and 26 , the combination lamps  33  are made up of a combination of direction indicators  34  and brake lamps  35  and integrally formed. The combination lamps  33  are respectively provided at the rear ends of the fender  31  on both right and left sides in such a manner as to irradiate light to the rear. The combination lamps  33  are covered with combination lamp covers  36 . 
         [0125]    The combination lamps  33  are formed in an approximately rectangular parallelepiped. Regarding the combination lamps  33 , an outer circumferential surface  34   a  in the right-left direction and an outer edge portion  34   b  (hatching portions in  FIG. 26 ) of the rear side surface are constituted as the direction indicators  34 . The direction indicators  34  are constituted such that the outer circumferential surface  34   a  and the outer edge portion  34   b  emit light. The direction indicators  34  are configured to light up when the brakes are used. 
         [0126]    Regarding the combination lamps  33 , an inner side portion  35   a  of the outer edge portion  34   b  on the rear side surface is constituted as the brake lamp  35 . Regarding the brake lamp  35 , the inner side portion  35   a  (the hatching portions in  FIG. 26 ) emits light, and a reflector  35   b  is constituted on its periphery. The light source of the brake lamp  35  is constituted of LEDs. It is noted that the light source of the brake lamp  35  is not limited to the LEDs. The combination lamps  33  is constituted in dual structure in which the outer circumferential surface  34   a  and the outer edge portion  34   b  on the rear side surface, and the inner side portion  35   a  can individually light up. 
         [0127]    Regarding the combination lamps  33 , the front end portion thereof is inserted into a rear concave portion  31   b  formed on an inclined surface  31   a  of the fender  31  and provided approximately horizontally. That is, the combination lamps  33  are provided in such a manner as to be hidden in the interior of the fenders  31  from an upper part of the front end to a lower part of the rear end of the fenders  31 . Regarding the combination lamps  33 , the lateral surface on the upper side thereof and part of the lateral surface (the outer circumferential surface  34   a  of the direction indicator  34 ) in the right-left direction are covered with the combination lamp cover  36 . The combination lamp cover  36  is mounted on the inclined surface  31   a  of the fender  31 . The combination lamp cover  36  is formed in such a manner as to extend with respect to the rear end of the combination lamp  33  while facing the rear from the midway portion of the inclined surface  31   a  of the fender  31 . 
         [0128]    The rear end portion of the combination lamp cover  36  is formed in such a manner as to be inclined upward from the midway portion of the inclination (the inclined surface  31   a ) of the rear end of the fender  31  when viewed from a lateral surface. That is, the combination lamps  33  is constituted in such a manner that the outer circumferential surface  34   a  of the direction indicator  34  can be visually recognized from between the inclination of the rear end of the combination lamp cover  36  with respect to the lateral side of the tractor  1  and the inclination of the fender  31 . 
         [0129]    It is noted that the mode of the direction indicator  34  and the brake lamp  35  in the combination lamp  33  is not limited to this. As another embodiment of the combination lamp  33 , as illustrated in  FIG. 27A , it may be constituted such that the combination lamps  33  are equally divided into upper and lower sections, and that the direction indicators  34  are arranged on one of the upper and lower sections, and the brake lamps  35  are arranged on the other of the upper and lower sections. Also, as illustrated in  FIGS. 27B and 27C , it may be constituted such that the size of one of the upper and lower sections divided is larger than the size of the other of the upper and lower sections, and that the direction indicators  34  are arranged on one of the upper and lower sections, and the brake lamps  35  are arranged on the other of the upper and lower sections. Also, as illustrated in  FIG. 27D , it may be constituted such that the combination lamps  33  are equally or unequally divided into right and left sections, and that the direction indicators  34  are arranged on the left side surface of the combination lamp  33  on the left side and the right side surface of the combination lamp  33  on the right side. 
         [0130]    With this constitution in the aforementioned manner, regarding the tractor  1 , a shadow is formed in the combination lamp  33  by means of the combination lamp cover  36 . Also, regarding the tractor  1 , the adhesion of dirt on the combination lamps  33  is reduced by the combination lamp covers  36 . Accordingly, regarding the tractor  1 , the direction indicators  34  of the combination lamps  33  can be visually recognized from both sides in the right-left direction while the visibility of the combination lamps  33  from the rear is improved. 
         [0131]    Next, the drive operating unit  37  will be described referring to  FIGS. 1, 2, and 28 . 
         [0132]    As illustrated in  FIGS. 1, 2, and 28 , the drive operating unit  37  performs various operations used for operating the tractor  1 . The drive operating unit  37  is provided in the interior of the cabin  26 . The drive operating unit  37  includes the instrumental panel  38 , a steering handle  40 , the operating seat  42 , an operating panel  43 , and the like. 
         [0133]    A variety of operating instruments and measuring instruments are arranged in the instrumental panel  38 . The instrumental panel  38  is provided in the center in the right-left direction of the front in the cabin  26 . The instrumental panel  38  is connected to the rear end of hood  7 . The instrumental panel  38  is formed approximately in the same shape made up of the upper surface  7   a , the upper left surface  7   b , the upper right surface  7   c , the left surface  7   d , and the right surface  7   e  of the hood  7  (see  FIG. 10 ). That is, the instrumental panel  38  is continuously connected to the rear end of the hood  7  without steps. Regarding the instrumental panel  38 , the inclined surface  38   a  that tilts downward from the connection end with the hood  7  to the drive operating unit  37  in the cabin  26  is formed. Regarding the instrumental panel  38 , the inclined surface  38   a  is formed in such a manner as to face the operator who sits on the operating seat  42 . 
         [0134]    In the instrumental panel  38 , an approximately rectangular air-conditioner discharge opening  38   b , whose longitudinal direction is the right-left direction, is formed in the vicinity of the connection portion with the hood  7 , that is, in the front end portion of the instrumental panel  38 . A concave portion  38   c  is formed below the air-conditioner discharge opening  38   b . A touch panel  39  is provided in the concave portion  38   c.    
         [0135]    The touch panel  39  displays and operates various instruments and operating switches such as a travelling speeds, engine revolutions, fuel gauges, and water temperature gauges. The touch panel  39  is provided in such a manner as to form a gentle angle (in such a manner as to form a slight angle with respect to the horizontal surface) with respect to the inclined surface  38   a  of the instrumental panel  38 . That is, the touch panel  39  is provided in the instrumental panel  38  in such a manner that the depth of the concave portion  38   c  increases as the concave portion  38   c  advances to the front. Accordingly, the touch panel  39  is constituted in such a manner that the light shined in from the front on a screen is not incident by means of the inclined surface  38   a  of the instrumental panel  38 . 
         [0136]    The steering handle  40  is used to operate the tractor  1 . The steering handle  40  is provided adjacent to the rear of the instrumental panel  38 . The steering handle  40  is constituted in such a manner that the height thereof is approximately the same with that of the instrumental panel  38 . Regarding the steering handle  40 , a convex portion  40   a  is formed wherein the right side front and the left side front face the center of the steering handle  40 . The steering handle  40  is supported by a steering column  41  via a plurality of column brackets  40   b.    
         [0137]    Regarding the steering handle  40 , a switch group  40   c  for performing various operations is provided in the column brackets  40   b . Regarding the steering handle  40 , the column brackets  40   b  are connected to the both sides in the right-left direction and the side (rear side) of the operating seat  42 . That is, the column brackets  40   b  are not arranged on the side (front side) of the instrumental panel  38  of the steering handle  40 . 
         [0138]    The operating seat  42  is provided in the rear of the steering handle  40  and between the right and left fenders  31 . Also, the operating panel  43  that includes an operating lever of a variable speed gear is provided in one of the right and left fenders  31  of the operating seat  42 . The operating panel  43  is arranged in a lateral concave portion  31   c  formed in the fender  31 . That is, the operating panel  43  is integrally formed with the fender  31 . 
         [0139]    With this constitution in the aforementioned manner, regarding the tractor  1 , it is easy for the operator to operate the touch panel  39  provided in the instrumental panel  38 . Also, regarding the tractor  1 , even when the steering handle  40  is provided near to the touch panel  39 , the operator easily recognizes the display of the touch panel  39 . Accordingly, the tractor  1  can improve the operability of the touch panel  39  provided in the instrumental panel  38 . 
       INDUSTRIAL APPLICABILITY 
       [0140]    The present invention can be applied to the technologies of work vehicles such as a tractor. 
       REFERENCE SIGNS LIST 
       [0141]      1  Tractor 
         [0142]      2  Rear wheel 
         [0143]      26   a  Cabin frame 
         [0144]      31  Fender 
         [0145]      32  Step 
         [0146]      32   a  Front supporting portion 
         [0147]      32   b  Receiving portion 
         [0148]      32   c  Rear supporting portion