PURPOSE: To provide a rolling bearing wherein a lubricant is uniformly supplied to a whole clearance between an outer ring and an inner ring to enhance lubricating performance, and abrasion and seizure caused by sliding of a steel ball on a contact surface due to rolling stop can be prevented.

CONSTITUTION: The rolling bearing is provided with a disc-shape rolling body separator 4 which is interposed between steel balls 3 adjoining to each other and can be rotated in compliance with rolling of the steel balls 3. A recess part 101 and a protrusion part 102 as an agitating part for agitating a lubricant are formed in the outer peripheral surface of the rolling body separator 4. The separator 4 is divided into a rolling body separator piece a104 and a rolling body separator piece b105, and they are connected to each other via a pin 106 so as to be rotated relatively.