Abstract: In each of track links (14) forming a crawler belt (13), an engaging projection (23) engaging to a drive wheel (11) is provided on a drive wheel abutting surface (22) abutting on the drive wheel (11). A fitting groove (27) composed of a bottomed recessed groove is provided on a ground contact surface (26) at the opposite side to the drive wheel abutting surface (22) in the upper-lower direction in a position corresponding to the engaging projection (23). Thereby, at the time of stacking up the track links (14) in the upper-lower direction, the fitting groove (27) of the upper track link (14) can be fitted into the engaging projection (23) of the lower track link (14).