A linear guide comprises a rail with profiled elements on two opposite sides, and a roll unit. The roll unit and the rails can be displaced in relation to each other in the longitudinal direction of the rails. The roll unit comprises at least two rolls which can run on the profiled elements of the opposite sides of the rail. The rolls are mounted on the roll unit by means of prestressed angular ball bearings and can be prestressed in relation to the rails by a pre-determined force.