To provide a rolling bearing which stabilizes and reduces dynamic friction torque in an early stage at operation start while securing sufficient lubricating performance.

In the rolling bearing 10 having a retainer 14 guided by an inner ring 11 or an outer ring 12, the retainer 14 is impregnated with lubricating oil, and a plurality of grooves extending to an axial direction and a plurality of grooves extended to a circumferential direction are formed on an inside diameter surface or an outside diameter surface 14a as a guide surface of the retainer 14. Thereby, agitating resistance caused by the lubricating oil is reduced, and rolling frictional resistance can be reduced. Further, in an initial stage of rotation, the dynamic friction torque can be suppressed to be low.