A linear roller bearing element with an endless rolling element channel is composed of a carrier raceway for the load-bearing rolling elements on a carrier body, a return channel for rolling elements that are returning, and turnaround channels that connect the carrier raceway and the return channel at both ends with each other in an endless manner, the turnaround channels being bounded by end covers. The roller bearing element has two rolling element channels with two longitudinally extending carrier raceways located next to each other within a common plane and with clearance between them, on the carrier body for load-bearing rolling elements, and two assigned return channels for rolling elements that are returning, and respective turnaround channels. With a linear roller bearing guide, these roller bearing elements are located between a guide rail and a guide carriage—which is supported such that it is displaceable relative to the guide rail—in order to provide support.