A coreless rubber crawler for use with a rolling wheel, the crawler comprising: an endless rubber elastic body; steel cords embedded in a longitudinal direction of the rubber elastic body; rubber projections formed at fixed intervals in the longitudinal direction at an inner surface of the coreless rubber crawler; and a rubber lug formed at an outer surface of the coreless rubber crawler, wherein bias cords (5, 6) are arranged mutually extending toward opposite sides in a lateral direction a respective lateral sides of the coreless rubber crawler, respective parts of the bias cords being layered one over another immediately beneath the rubber projections to define a layered part, and the layered part covers a central part in a lateral direction of the rubber projections and parts at either side thereof; wherein the rubber projections are positioned at a central part in a lateral direction of the coreless rubber crawler; wherein the bias cords (5, 6) extend inclined relative to a circumferential direction of the coreless rubber crawler; wherein the bias cords (5, 6) are embedded in the rubber elastic body at a radially outer side of the steel cords embedded therein; wherein a central position in the lateral direction of the layered part corresponds to the central part of the rubber projections in the lateral direction of the coreless rubber crawler; wherein the layered part extends at least across an entire width of the rubber projections; characterized in that the layered part is structured not to reach that part of the coreless rubber crawler upon which the rolling parts of the rolling wheels roll on the both side surfaces of the rubber projections when the coreless rubber crawler is used with a rolling wheel. an endless rubber elastic body; steel cords embedded in a longitudinal direction of the rubber elastic body; rubber projections formed at fixed intervals in the longitudinal direction at an inner surface of the coreless rubber crawler; and a rubber lug formed at an outer surface of the coreless rubber crawler, wherein bias cords (5, 6) are arranged mutually extending toward opposite sides in a lateral direction a respective lateral sides of the coreless rubber crawler, respective parts of the bias cords being layered one over another immediately beneath the rubber projections to define a layered part, and the layered part covers a central part in a lateral direction of the rubber projections and parts at either side thereof; wherein the rubber projections are positioned at a central part in a lateral direction of the coreless rubber crawler; wherein the bias cords (5, 6) extend inclined relative to a circumferential direction of the coreless rubber crawler; wherein the bias cords (5, 6) are embedded in the rubber elastic body at a radially outer side of the steel cords embedded therein; wherein a central position in the lateral direction of the layered part corresponds to the central part of the rubber projections in the lateral direction of the coreless rubber crawler; wherein the layered part extends at least across an entire width of the rubber projections; characterized in that the layered part is structured not to reach that part of the coreless rubber crawler upon which the rolling parts of the rolling wheels roll on the both side surfaces of the rubber projections when the coreless rubber crawler is used with a rolling wheel.