The framework includes a pair of right and left side frames extending in the longitudinal direction of the vehicle, a second cross member connected to the rear portions of the side frames so as to bridge along the lateral direction of the vehicle and supporting the rear portion of the motor, and the side frames. A third cross member is connected to the rear of the second cross member so as to bridge along the right-left direction of the vehicle, and detachably supports the spare tire so as to hang it. The third cross member is formed in an inverted U shape, has a spare tire lifting device in the middle in the longitudinal direction, and has attachment portions to which the rear ends of the leaf springs are attached at one end side and the other longitudinal end side of the third cross member.

The frame includes a pair of left and right side frames, a second cross member that is connected to the rear portion of the side frames and supports the rear portion of the motor, and the side frames that extend behind the second cross member along the left-right direction of the vehicle. and a third cross member for detachably suspending and supporting the spare tire so that the spare tire is placed horizontally with the front side lowered, and the spare tire is placed in the middle of the third cross member in the longitudinal direction. A raising and lowering device for supporting and elevating the spare tire is provided, and a raising and lowering guide is provided in the middle of the second cross member in the longitudinal direction to guide the spare tire so that it maintains its posture when the spare tire is lifted or lowered.