Patent ID: 7967512

Claim:
A rolling bearing unit for rotatably supporting a rotation shaft on a housing, comprising: a radial bearing including an outer ring the outer ring including: a larger-diameter outer circumferential surface formed on one axial end portion thereof; a smaller-diameter step portion formed at the other axial end portion thereof and having a retaining recessed groove formed therein and a step surface formed between the larger-diameter outer circumferential surface and the smaller diameter step portion; a retainer plate having a fitting hole formed through a central portion thereof, to which the smaller-diameter step portion is outwardly fitted, and a retaining projection formed on an inner circumferential surface of the fitting hole and a retaining ring of an interrupted ring-shape which is made of a resilient material, and includes a smaller-diameter portion received in the retaining recessed groove in the outer ring, and a larger-diameter retaining portion projecting radially outwardly from an outer circumferential surface of the smaller-diameter step portion of the outer ring; wherein the retainer plate is disposed between the step surface of the outer ring and the larger-diameter retaining portion of the retaining ring so as to rotate relative to the smaller-diameter step portion of the outer ring and so as to prevent the retainer plate from falling off therefrom to the other axial end side.