To run each carriage on the same wheel trail in the case of connecting a plurality of the carriages, without generating an inner wheel difference, in the case of using the carriage as a handcart, to make this side front wheel turnable, fix a rear wheel to straight advancing, so that the carriage can be used as in the conventional carriage.

A turn shaft part 2a of a front wheel 2 and a turn shaft part 3a of a rear wheel 3 are connected by a right/left respective back-to-back mechanism 18, 18, a slider piece 6 turn operating the front wheel 2 and a link lever 7a connecting the back-to-back mechanism 18 are provided in a lock unit 7 separable from the turn shaft part 2a. The fellow right/left link levers 7a, 7a are connected by a tuning shaft 9, to be tuned to a steering lever 12 bearing supporting a rear end to an interfront wheel center position, the tuning shaft 9 is right/left moved. In a tip end of the steering lever 12, a traction bar 4 is connected, by operating the traction bar 4, separating action of the lock unit 7 is performed, to be switched so as to make the front wheel turnable. Here, by fixing the steering lever 12 to a central position, the rear wheel 3 is fixed to straight advancing.