PURPOSE: To facilitate attaching and removing a crawler guide, in a crawler guide provided with a guide for crawler breaking-off prevention from the ground contact side middle part of a crawler 6 through the proximity of a driving wheel side at least, by making the crawler guide separate from a guide part and a mounting stay part.

CONSTITUTION: A crawler 6 which is wound around a driving wheel 1, a driving wheel 3 and a rolling wheel 4... consists of rubber material, in the inner center of which core bars are arranged and at the outside lugs are installed. Also, a guide 8 for crawler breaking-off prevention is installed, which is invaded between left and right core bar protrusions 7, 7 and is mounted on a supporting member 10 fixed at a traveling frame 5 through a mounting stay 8b and a bolt 9. The arranging distance between middle rolling wheels 4b and 4C is set larger than the whole length of the crawler guide 8, which permits the crawler guide 8 to be taken in and out from an interval part L easily. Also, the crawler guide 8 is constituted so that the guide part 8a and the mounting stay 8b part may be connected and disconnected by a bolt 11.