To improve a turning performance by subjecting an angle part to a C or R(roundness) shape chamferring in at least a lug top surface facing the fore and aft in the advinacing direction of a clawler.

In lugs made of rubber 3, 4 of a rubber clawler 1, angle parts in the forward and rearward direction are subjected to a C shape chamferring 3a, 3b, 4a, 4b. These chamber parts 3a, 3b, 4a, 4b have an angle of 30 degrees or more with respect to a horizontal direction and a length of 5 mm or more in the forward and rearward direction. The chamferring may be a R(roundness) shape chamferring. With this constitution, a resistance on a portion in an idler winding part grounding the earth is reduced. Especially, in the lug arranged at right angles to the advance direction of a machine body of a shovel having less spaced angle between the rubber clawler 1 and the ground, the effect to reduce the wear friction is much, which improves the turning performance.