A multipoint contact ball bearing in constructed to prevent damage to rolling surfaces of the balls and to ensure durability while maintaining radial load capacity. An inner raceway has a complex curved surface including a pair of side surface sections having a generating line shape with a radius of curvature larger than 50% of the ball diameter, and an inner raceway bottom section connecting inside end edges in the width direction of the side surface sections. The inner raceway bottom section is a concave curved surface having a generating line shape with a radius of curvature less than 50% of the ball diameter. The edges of both sides in the width direction of the inner raceway bottom section and the inside end edges of the inner raceway side surface sections are smoothly continuous, and finishing is performed on the inner raceway bottom section and the inner raceway side surface sections.

A cylindrical roller bearing includes at least one outer ring with a raceway, an inner ring with a raceway, and a plurality of cylindrical roller elements rollable along the raceways of the inner ring and the outer ring. The raceway of the inner ring has an at least partly crowned profile, the crowned profile having a crowning radius R and is formed such that: 25 L.sup.2/D<R<55 L.sup.2/D, in which L is the length of each one of the cylindrical roller elements and D is the diameter of each one of the cylindrical roller elements.