To enable traveling of a vehicle such as a hand truck with a heavy load on one or both of a step and stairs very easily as compared with that of conventional art, while a flat surface travering is same as that of conventional art.

On a hand truck 34 transportably supporting a bedplate 1 with a universal caster 2 and a non-swivellable rear-wheel 8, an altering device of vehicle supporting position is provided which supports an bedplate 1, when the truck 34 travels on a step and stairs, with the rear-wheel 8 moved forward from the position of the rear-wheel 8 at flat surface traveling, lifts the front part of the bedplate 1 by using the supporting position as a fulcrum, and allows traveling under the condition of lifting the front part of the hold plate 1.