To travel even on the stairs and a flat place easily without conducting switching between a crawler mechanism for going up and down on the stairs and wheels for traveling on the flat place.

This traveling device is provided with a crawler mechanism having a crawler belt 1a having protrusuon at its outside surface, a driving pulley which engages with the front end and rear end of the inside of the crawler belt 1a separately respectively for driving the crawler belt la in one direction by driving its rotation in the same direction around respective rotating shafts, and driving sources 8a, 8b which drives the rotation of the driving pulley. This traveling device, which is mounted respectively on the right and left of its lower part when viewed from the above, is provided with wheels 2a, 2b at the rotating shafts of the respective driving pulleys, and comb-toothed protrusions Y1, Y2 higher than the protrusion part of the crawler belt 1 at the outer periphery of the wheels 2a, 2b.