To provide an easy transportation tool on stairs for facilitating transportation without lifting a carry bag when going up and down the stairs.

A caterpillar type belt 3 and a rotating wheel 4 are combined between casters 2 at the bottom of the carry bag 1 at a position a little lower than the casters 2. A wheel support horizontal shaft 5 is mounted and fixed on the bottom of the carry bag 1 with a pillar 6. The traveling direction of the bag 1 is made to be longitudinal when going up and down the stairs. The caster 2 is placed at the corner of the steps, then rotated by the caterpillar type belt 3, and smoothly moved to the next step so as to go up and down.