A guide device having, a guide rail and a runner, which engages at least in part in the guide rail and is guided in a linearly movable manner in the guide rail via a recirculating ball bearing. The balls associated with the recirculating ball bearing are arranged in at least one ball row and guided in at least one ball raceway. The balls associated with a ball row are each guided in a ball raceway composed of two partial ball raceways. The first partial ball raceway is formed in the runner and extends along a runner longitudinal axis. The second ball raceway is formed by a guide groove, formed on the runner and extends along the runner longitudinal axis, and a guide rail guide groove, opposite the runner guide groove and formed on the guide rail.

Provided is a motion guide apparatus capable of improving performance such as the repeated durability of and movement in a turn portion.

The motion guide apparatus sandwiches a ball (3) between a wall surface of a rolling groove (7) of a rail member (2) and a wall surface of a turn groove (10) of a block (4) to change the course of the ball (3) that has moved along a rolling path. +<180 is satisfied where is a rail member-side angle, and is a block-side angle.

A linear motion guide unit includes a rail, a slider, and a plurality of balls. The slider includes a coil spring arranged in a first circulation passage so as to extend in a longitudinal direction. The coil spring includes a pair of first regions provided at both ends in the longitudinal direction and fitted in the first circulation passage, and a second region smaller in diameter than the pair of first regions and positioned between the pair of first regions with a gap from an inner wall surface of the first circulation passage.