To facilitate exchangeability between wheel type and semi-crawler type drives and improve drivability with the semi-crawler type, in a working vehicle which permits the semi-crawler type or a wheel type rear wheel to be selectively attached to a rear axle.

On a front wheel transmission shaft 37, a rotation switching part 40 is provided at a lower position of a spacer transmission case 14b. By the operation of a mode selecting part provided near a driver's seat, the rotation switching part 40 is switched, thus it is possible to easily change a rotational speed transmitted to the front wheel using the wheel type and the semi-crawler type.