To improve the life of an endless part by constituting it in such a manner as distributing the rigidity in overlapping steel cord rows.

In a structure of an endless part of a rubber crawler, tips 3a, 4a projecting from a rubber elastic body of a steel cord row 1 are formed into divided three stages A, B, C. When unvulganized rubber is vulgarized in this part to become endless, the rigidity in this part is distributed so as to reduce the fatigue (stress concentration) of the steel cord row 1 caused by difference in the rigidity in this endless part. The tip of the steel cord row of the rubber crawler, though it is perpendicular to the longitudinal direction of the rubber elastic body, thus distributes the rigidity of the endless part by arranging it dividedly or inclinedly so as to avoid the load from concentrating and improve the durability of the rubber crawler.