Disclosed is a rubber crawler which makes it possible to ensure reduced vibration during travel, good grip with the ground, and good earth discharge properties; and moreover which has excellent durability. A rubber crawler (1) in which a plurality of core bars (30) are embedded in an endless strip-shaped crawler main body (10) comprising an elastic material, and drive wheel engaging holes (12) are provided at prescribed intervals in the circumferential direction in the central section in the width direction of the crawler main body (10). Lugs (15) are provided at prescribed intervals in the circumferential direction on the outer peripheral surface side and are divided into left and right sides from the central section. The lugs (15) which are divided to the left and right have a staggered arrangement with a circumferential phase offset. The lugs (15) have a trapezoidal cross section comprising a ground contact surface (20), a front inclined surface (18) and a rear inclined surface (19), and extend circumferentially from the central section at an inclination with respect to the width direction. The lugs (15) comprise narrow parts (26) which extend over three adjacent core bars (30) in the circumferential direction when viewed as a plane and narrow in the circumferential direction at the central part in the width direction.