PURPOSE: To reduce force applied to a wheel at the time of the wheel passing a protruding object by providing a bogie of a vehicle with a link forming the base of a link mechanism in the shape of an equal leg base, as well as providing a pair of wheels at both end parts of a link forming a side opposed to the base of the link mechanism.

CONSTITUTION: In a moving device body 11 provided with two sets of bogies 14 supported through springs 12 and shock absorbers 13 and restricted in its movement except its vertical movement by linear guides 15, the bogie 14 is provided with a link mechanism 16 comprising links 161-164 forming a quadrangular equal leg base, in the state of mutually adjacent ones of the links 161-164 being connected rotatably. The link 161 forming the base of the link mechanism 16 is fitted to the truck 14, as well as wheels 181, 182 are supported, through axles 171, 172, at both ends of the link 163 opposed to the link 161. Accordingly, when one wheel is passing a protruding object on a travel path, force is concentrated on the other wheel so as to reduce force applied to the one wheel.