Motion guide device

A motion guide device comprising:

• a track member including a rolling member rolling surface;
• a movable member including a loaded rolling member rolling surface facing the rolling member rolling surface, and including a rolling member return passage extending generally parallel to the loaded rolling member rolling surface;
• a pair of cap members provided at both front and rear ends of the movable member in a movement direction, and each of the pair of cap members including a direction change passage connecting the loaded rolling member rolling surface and the rolling member return passage;
• and
• a plurality of rolling members arrayed in a rollable manner within an endless circulation passage made up of a loaded rolling member rolling passage, the rolling member return passage, and a pair of the direction change passages passage of each of the pair of cap members, the loaded rolling member rolling passage being made up of the rolling member rolling surface included in the track member and the loaded rolling member rolling surface included in the movable member, wherein
• in a cross-sectional view perpendicular to a longitudinal direction of the track member, the cross-sectional view including the rolling member being positioned at a boundary portion between the direction change passage and the loaded rolling member rolling passage, a first gap between the rolling member and a first end portion of a rolling surface of the direction change passage closest to the rolling member rolling surface included in the track member in the cross-sectional view is smaller than a gap between the rolling member and the rolling member rolling surface closest to the first end portion of the rolling surface of the direction change passage in the cross-sectional view.