Outer rear end surfaces of a pair of front frames are connected to corresponding inner front end surfaces of a pair of main frames with spacers being interposed therebetween. Accordingly, a width between the front frames is independent of a width between the main frames, so that maximum steerable angles of front wheels can be increased as much as possible without increasing a mounting pitch of the front wheels. The front frames can be arranged such that at least upper regions of the rear end surfaces thereof are located forward of the mount flange, and the engine unit and the flywheel unit are supported by the vehicle frames such that at least lower portions thereof overlap the vehicle frames in a side view, and the mount flange overlap the upper regions of the rear end surfaces of the front frames in a front view.