To provide a manufacturing method of a cage for a needle bearing to manufacture the cage for the needle bearing with improved reliability, and to provide a cage for a needle bering.

The wall thickness of a plate P as material of the cage 12 is partially changed in advance. When the cage 12 is formed of the plate P, the wall thickness of a reduced diameter part 12c is less than the wall thickness of a guide face 12d and the wall thickness of a flange part of an annular part 12a. Therefore, the wall thickness of a part to which large load is applied can be secured to reduce mass of a whole cage while optimizing the wall thickness, and the cage 12 with high strength and high speed property can be formed.