To provide a linear guide device capable of speedily braking a movable member when abnormality such as power failure occurs.

As stop of a positive pressure pump P+ occurs due to power failure or the like, a valve V2 is immediately actuated to release the inside of a pressure part 15 through piping C2 to atmospheric air. As the valve V2 becomes equal to an atmospheric air state, pressure in the pressure part 15 becomes equal to the atmospheric pressure to eliminate isolation force. A brake pad 14 is thus pushed by energizing force of an elastic plate 13 toward a plate G. A slider 11 is quickly stopped by friction force added between the plate G and the brake pad 14.