PROBLEM TO BE SOLVED: To provide a work vehicle which can improve connection strength of a work machine when connecting a work machine to a traveling machine body in a detachable manner and can be set compact in the whole body, the traveling machine body and the work machine thereof.SOLUTION: A work machine 6 for performing soil work is connected to a rear part of a traveling machine body 3 via a lifting link 4 and a hitch device 21 in a liftable manner. The hitch device 21 includes a rear hitch 27 on a front part side of the work machine 6, a front hitch 26 on a rear part side of the lifting link 4, and a lock member 59, and is provided with at least two receiving members 33, 34 arranged vertically and having concave groove parts 33b, 34b whose right above side is opened in a side view on the front hitch 26, and upper and lower connection pins 48, 49 in a horizontal direction for locking by being hooked in the upper and lower groove parts 33b, 34b in the rear hitch 27. The lock member 59 arranged on the upper side of one receiving member 34 locks the connection pin 49 in the groove part 34b by blocking the upper side.
