To provide a device capable of securely maintaining a connecting state of a working vehicle used both on rails and a road and having wheels for traveling on rails and crawlers for traveling on the land (road surface) with a trolley without causing troubles.

In the working vehicle 1 used both on rails and a road and having the wheels 3 for traveling on rails and the crawlers 2 for traveling on the land, the wheels 3 are rotatably supported by oscillation members 6, and the trolley 4 is connected to the oscillation member 6 via a connecting rod 5. Connecting pieces 13 are provided at both ends of the connecting rod 5 so as to enable lateral axial rotation. Upper and lower support part pieces 7A, 7B provided in the oscillation member 6 are connected to one of the connecting pieces 13 interposed between the support part pieces 7A, 7B so as to enable vertical axial rotation. Upper and lower support part pieces 7A, 7B provided in the trolley 4 are connected to the other of the connecting pieces 13 interposed between the support part pieces 7A, 7B so as to enable vertical axial rotation.