In a linear guide bearing apparatus wherein a separator is interposed between
adjacent balls K and K moving following a curved circulating path 8, and
the ball K contacts concave faces W of the separator T at both ends in an axial
line direction and at the same time the ball K rolls as contacting a guide face
8a of an outside guiding member 5 and a guide face 8b
of an inside guiding member 9, the separator has an outer diameter larger
than a maximum outer diameter L under a condition where the ball rolls as
simultaneously contacting both curved faces 8a, 8b of
the inside and the outside of the curved circulating path 8, and the radius
of curvature of the guiding face 8b in the curved circulating path
8 is reduced to a size not contacting the separator T.
