To provide a bearing in which heat generation property, vibration and acoustic property of a retainer are suppressed.

A rolling bearing includes: an inner ring 2; an outer ring 3; a plurality of cylindrical rolling bodies 4 which roll on a raceway surface of an outer ring inner peripheral surface and a raceway surface of an inner ring outer peripheral surface and make the inner ring and the outer ring relatively rollable; and a metallic retainer 5 provided by integrally molding a plurality of pockets for storing the plurality of rolling bodies in order to retain the plurality of rolling bodies at a predetermined interval. Therein, a pocket surface of the retainer opposite to a cylindrical surface of the rolling body has a single concave circular-arcuate surface and, in the relation of a diameter of the cylindrical rolling body and a gap between the pocket surface of the retainer opposite to the cylindrical surface of the rolling body and the cylindrical surface of the rolling body, the gap is formed so as to be 0.5 to 6% of the diameter and a gap H2 between the retainer and the diameter is formed so as to be 0.1 to 1.5% of a diameter D2 of the inner peripheral surface of the outer ring as a guide surface of the retainer.