In order to provide a long-life, highly-reliable guide apparatus which exhibits dustproof performance and prevents intrusion of dust into the moving block in environments where there are lots of fine dust such as gypsum and ceramic powder and where no oil contents or oil contents are not liked, there is provided a guide apparatus having a track rail 11, in which rolling-element raceway grooves 12-1 to 12-4 are formed along a longitudinal direction thereof, and a moving block 20 attached to the track rail by way of a plurality of rolling elements in a relatively-movable manner, wherein an end-face dustproof brush 25, which has a brush member 36 whose tip end contacts a surface of the track rail 11 and which eliminates extraneous matters adhering to the surface of the track rail 11 by means of the brush member 36, is attached to outside of each of the side covers 22 with respect to the direction of relative movement.