The present invention provides a rubber crawler with high durability by using the rubber composition, wherein said rubber composition exhibits enhanced adherence between rubber and metal reinforcing material, such as steel cord and the like, particularly adherence after heat aging and under high humidity, without using vulcanizing retarder, such as CTP, which has possibility of generating problems, such as blooming and lowering rubber physical properties after vulcanization; using vulcanization accelerator having the adequate vulcanization retarding effect exerting excellent working ability; lowering rubber scorching as much as possible. The rubber crawler of the present invention comprises a rubber composition as the treatment rubber thereof, which comprises in the amount of 0.1 to 10 parts by weight of sulfenamide-containing vulcanization accelerator, 0.03 to 3 parts by weight of cobalt-containing composition as the equivalent amount of cobalt and 0.3 to 10 parts by weight of sulfur, relative to 100 parts by weight of rubber component.