To enlarge the ground contact area of an iron shoe, sufficiently secure tractive force, and ensure the coupling with drive sprocket teeth at a wound section by providing connecting links between crawler component links adjacent in the crawler longitudinal direction, and connecting them with hinge members.

Crawler components 3 each having a shoe 1 and links 2 are provided in parallel in the crawler longitudinal direction, connecting links 4 are provided between the links 2 of the crawler components 1 adjacent in the crawler longitudinal direction, and they are connected by hinge members 5. Tubular track bushes 8 are provided in the front and rear of the right and left links 2, and a pin 9 is inserted into each track bush 8 to form the hinge member 5. When sprocket teeth are practically meshed with or removed from the track bushes 8, a crawler is circulatively rotated, and the crawler component 3 is bent at the wound section with a sprocket tooth centering on the hinge member 5.