ROLLING BEARING DEVICE

PROBLEM TO BE SOLVED: To realize miniaturization while securing sealing performance in a rolling bearing device in which one end side of an outer ring is blocked by a cap made of resins. SOLUTION: A groove part 1b is provided to an internal corner on the large diameter circumferential face 1a on the vehicle inner side on the inner peripheral face of the outer ring 1. A tapered chamfer 10d is provided to the tip side corner part on the outer peripheral face of a cylindrical part 10a of the cap 10. An O-ring 20 is compressed with the groove part 1b and the tapered chamfer 10d. By this, it is possible to prevent muddy water or the like from entering along the fitting face of the large diameter circumferential face 1a of the outer ring 1 and the cylindrical part 10a of the cap 10, and at the same time, it is not necessary to secure an installation space of the O-ring 20 in the middle of the axial direction of the fitting region of the outer ring 1 and the cap 10. COPYRIGHT: (C)2004,JPO