BEARING

The present application provides a bearing, comprising an outer ring, an inner ring, rolling bodies, and a cage. The cage comprises a main body portion and a plurality of extension portions, the main body portion is annular; the plurality of extension portions are provided on the side surface of the main body portion, and adjacent extension portions and part of the main body portion therebetween form pockets for accommodating the rolling bodies; each extension portion comprises a first extension section and a second extension section; the first extension section is connected to the main body portion; the second extension section is connected to the first extension section; and in a direction moving away from the main body portion, radial outer surfaces of the first extension section and the second extension section are both contracted towards the center of the cage. By using the bearing of the present application, materials at the end face of a radial outer surface of the cage close to the extension portions