BALL BEARING

To provide a ball bearing capable of suppressing the occurrence of seizure or wear by suppressing the shortage of an oil amount on a rolling surface during high speed rotation.SOLUTION: In a ball bearing 100, a cage 16 has pockets each consisting of an upstream side claw part 16a provided on the revolution upstream side and a downstream side claw part 16b provided on the downstream side for holding rolling elements 14. In all range between a center line X0 connecting the centers of the plurality of rolling elements 14 and an end parallel line X1 where the center line X0 is parallelly moved to the end of the upstream side claw part 16a or the downstream side claw part 16b, an angle θf formed between a tangential line Tf and the center line X0 at an intersection point between a parallel line L formed by parallelly moving the center line X0 and the front face on the upstream side of the upstream side claw part 16a is set larger than an angle θr formed between the tangential line Tr and the center line X0 at an intersection point between the parallel line L and the rear face on the downstream side of the downstream side claw part 16b to make the upstream side claw part 16a and the downstream side claw part 16b into an asymmetrical shape.SELECTED DRAWING: Figure 3 【課題】高速で回転しても、転動面における油量不足を抑制し、焼き付きや摩耗の発生を抑制できる玉軸受を提供する。【解決手段】玉軸受１００であって、保持器１６は、公転の上流側に設けられた上流側爪部１６ａと下流側に設けられた下流側爪部１６ｂで構成されたポケットによって転動体１４を保持し、複数の転動体１４の中心を繋ぐ中心線Ｘ０と、中心線Ｘ０を上流側爪部１６ａ又は下流側爪部１６ｂの端部まで平行移動させた端部平行線Ｘ１との間のすべての範囲において、中心線Ｘ０を平行移動させた平行線Ｌと上流側爪部１６ａの上流側の前面との交点において接線Ｔｆが中心線Ｘ０となす角度θｆを平行線Ｌと下流側爪部１６ｂの下流側の後面との交点において接線Ｔｒが中心線Ｘ０となす角度θｒより大きくすることで上流側爪部１６ａと下流側爪部１６ｂを非対称形状とする。【選択図】図３