PURPOSE: To provide a running mechanism which can go on an uneven surface, for example with steps, stairs, etc., and can move on a flat ground in the same manner as with usual wheel.

CONSTITUTION: A wheel 13 is installed at the tip of a driving shaft 11, and a plurality of rods 27, 27,... are installed inside the wheel 13 in such a way as movable in the radial direction. The base end of each rod 27 is put in slide contact with the peripheral surface of an eccentric cam 26 mounted on the drive shaft 11. The cam 26 can be held in any desired attitude, for example movement is made to go over a step L, the cam attitude is held so that the tips of rods 27 protrude from the periphery of the wheel 13 at the position with step L, and mobility is given when the tips of the rods 27 are engaged by the step L.