Crown cage for ball bearing, and ball bearing

The outer diameter (D1) of the claw part (31) is smaller than the outer diameter (D2) of the main part (20), the radial width (t1) of the claw part (31) is equal to or less than 1/2 of the radial width (t2) of the main part (20), the axial width (H1) from the upper surface (33A) of the connecting part (33) of the column part (30) to the bottom surface (26) of the main part (20) is equal to or less than 1/2 of the axial width (H2) of the crown cage (10) for the ball bearing, and an opening part (27) is arranged between adjacent pockets (40) in the main part (20). 爪部(31)的外径(D1)比主部(20)的外径(D2)小，爪部(31)的径向宽度(t1)为主部(20)的径向宽度(t2)的1/2以下，从柱部(30)的连接部(33)的上表面(33A)到主部(20)的底面(26)的轴向宽度(H1)为滚珠轴承用冠型保持架(10)的轴向宽度(H2)的1/2以下，在主部(20)中，在相邻的兜孔(40)之间设置有开口部(27)。