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 uppe
