Linear guide device

A linear guide device comprising:

• a guide rail having rolling element rolling grooves which extend in the axial direction;
• a slider having rolling element rolling grooves which face the rolling element rolling grooves of the guide rail and which straddles the guide rail, the slider being configured to move in the axial direction through rolling of a plurality of rolling elements inserted between the rolling element rolling grooves;
• and
• a side seal member attached to an axial direction end part of the slider, wherein
• the side seal member is formed integrally and has a flat surface facing the guide rail,
• a clearance between the side seal member and the guide rail is kept the same on a whole of the side seal member, and
• a thickness in the axial direction of the side seal member is 25 to 140 times the clearance.