A rubber crawler comprising: an endless rubber body that is trained around a plurality of wheels (100, 102); a main cord layer that is incorporated within the rubber body and includes a main cord configured from a plurality of twisted strands covered with rubber, the main cord extending around a rubber body circumferential direction; and a bias cord layer that is incorporated within the rubber body further to a rubber body circumferential outside than the main cord layer and configured from at least one bias ply that is formed from a plurality of bias cords extending at an angle with respect to the rubber body circumferential direction, disposed side-by-side around the rubber body circumferential direction and covered in rubber such that bias cords of the bias ply at a circumferential outermost side of the rubber body are, as viewed from the rubber body circumferential outside, angled toward an opposite side, with respect to the rubber body circumferential direction, from the angled side of the strands, wherein, in one side in the rubber body width direction from the center of the rubber body width direction, the direction of the strands of the main cord, the main cord being to the one side of the center of the rubber body width direction, is, as viewed from the rubber body circumferential outside, angled toward an opposite side, with respect to the rubber body circumferential direction, from the direction of the bias cords of the bias ply at a circumferential outermost side of the rubber body, and wherein, in the other side in the rubber body width direction from the center of the rubber body width direction, the direction of the strands of the main cord, the main cord being to the other side of the center of the rubber body width direction, is, as viewed from the rubber body circumferential outside, angled toward an opposite side, with respect to the rubber body circumferential direction, from the direction of the bias cords of the bias ply at a circumferential outermost side of the rubber body. an endless rubber body that is trained around a plurality of wheels (100, 102); a main cord layer that is incorporated within the rubber body and includes a main cord configured from a plurality of twisted strands covered with rubber, the main cord extending around a rubber body circumferential direction; and a bias cord layer that is incorporated within the rubber body further to a rubber body circumferential outside than the main cord layer and configured from at least one bias ply that is formed from a plurality of bias cords extending at an angle with respect to the rubber body circumferential direction, disposed side-by-side around the rubber body circumferential direction and covered in rubber such that bias cords of the bias ply at a circumferential outermost side of the rubber body are, as viewed from the rubber body circumferential outside, angled toward an opposite side, with respect to the rubber body circumferential direction, from the angled side of the strands, wherein, in one side in the rubber body width direction from the center of the rubber body width direction, the direction of the strands of the main cord, the main cord being to the one side of the center of the rubber body width direction, is, as viewed from the rubber body circumferential outside, angled toward an opposite side, with respect to the rubber body circumferential direction, from the direction of the bias cords of the bias ply at a circumferential outermost side of the rubber body, and wherein, in the other side in the rubber body width direction from the center of the rubber body width direction, the direction of the strands of the main cord, the main cord being to the other side of the center of the rubber body width direction, is, as viewed from the rubber body circumferential outside, angled toward an opposite side, with respect to the rubber body circumferential direction, from the direction of the bias cords of the bias ply at a circumferential outermost side of the rubber body.