PURPOSE: To facilitate the full-up by forming a recessed part to a grounding side surface part of a ground supporting member.

CONSTITUTION: A traveling crawler consists of driving wheels 1a, driven wheels 1b, rolling wheels 1c, crawler belts 1d to wind these components or the like. A supporting shaft 11 is provided in the transverse direction at the front part of a vehicle body 2, and at the same time, bearings are constituted around this shaft center in a rotatable manner relative to a traveling frame 13. A ground supporting member 13 is provided with a ground stabilizing and holding member 14 at the ground side end part so as to realize the L-shaped arrangement viewed from the side, and the ground supporting member is provided in a swayable manner in the longitudinal direction where the vehicle body is advanced by fitting and fixing the upper end part to the supporting shaft 11. A recessed part 15 is formed at the grounding part on the counter-ground side of the ground supporting member 13. Thus, the ground supporting member 13 is ground-supported at two grounding points P1, P2 due to existence of the recessed part 15.