In a linear guide bearing apparatus in which a lubricant feeding member 20 attached to an axial end of a slider 2 and making sliding contact with the rolling body rolling grooves 3 of a guide rail 1 to feed a lubricant thereto is of a porous material containing the lubricant and is pressed outwardly along the width of the slider 2 by a pressing member 31 fitted in the lubricant feeding member 20 at an upper portion thereof to have its sliding contact portions 21 pressed against the rolling body rolling grooves 3 of the guide rail 1, the lubricant feeding member 20 is housed in the casing 30 formed integrally with the pressing member 31.