The invention proposes a linear guide unit comprising a guide carriage (1) that is mounted through rollers (3) for sliding on a guide rail (2), and further comprising a roller chain (8) comprising a cage (8a) for receiving the rollers (3), said cage being formed by spacers (16) arranged between adjacent rollers (3) and flexible belts (17) arranged at two front ends of the rollers (3) for connecting the spacers (16) to one another, said roller chain (8) being arranged for rotating in an endless roller channel (7) comprising a load-bearing section (10), in which the rollers (3) roll under load on raceways (4, 11) of the guide carriage (1) and of the guide rail (2), a return section (12), that is arranged substantially parallel to the load-bearing section (10) and in which the rollers (3) of the roller chain (8) are unloaded, and two deflecting sections (13) that connect the return section (12) and the load-bearing section (10) endlessly to each other, said endless roller channel (7) comprising lateral rims (14) at both front ends of the rollers (3) for guiding the rollers (3), each lateral rim (14) comprising a groove (15) for receiving one of the belts (17) of the cage (8a), said groove (15) comprising a groove bottom (20), an inner groove wall (19) for an inner belt side of the belt (17) and an outer groove wall (18) situated opposite the inner groove wall (19) for an outer belt side of the belt (17), wherein the outer groove wall (18) and the inner groove wall (19) of the groove (15) in the deflecting section (13) are made on separate parts.