The present invention is an inner ring with an inner ring orbit formed on an outer diameter surface, an outer ring orbit formed on an inner diameter surface, and having a larger diameter than the inner ring to form a radial gap between the outer ring track and the inner ring track, and the inner ring track and outer ring A cage for oil-lubricated ball bearings provided between an inner ring and an outer ring of a ball bearing including a plurality of balls that are spaced apart along a circumferential direction between tracks to maintain a gap between the balls; Ring-shaped and spaced along the circumferential direction to form a plurality of pockets and made of plastic material; A ring-shaped body portion and a plurality of partition walls spaced along the circumferential direction and protruding from the body portion on one side in the axial direction, and a pocket into which the ball is inserted by being concavely curved between the partition walls is formed; Further comprising a protruding band portion protruding from the body portion to the other side in the axial direction in which the partition wall protrudes, the protruding band portion protrudes from the radial center of the body portion and the radial width is smaller than the radial width of the body portion It relates to a cage for oil-lubricated ball bearings.
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