Patent ID: 7571706

Claim:
A needle roller bearing comprising: a plurality of needle rollers; and a retainer for retaining said needle rollers, wherein said retainer includes a pair of annular parts and pillar parts connecting said pair of annular parts so as to form pockets in which said needle rollers are housed, a sidewall surface of said pillar part has a sheared surface punched by a punching blade so that said pockets are formed, and a fractured surface fractured by a material pressed by the punching blade, and said needle roller is guided by said sheared surface, wherein said pillar part has a configuration in which its center part is recessed toward the inside in a diameter direction from its end parts connected to said annular parts, and wherein said sheared surface is positioned on the outside in the diameter direction of said end parts and said center part, said fractured surface being positioned on the inside in the diameter direction of said end parts and said center part, and a length in an axial direction of said sheared surface that is positioned on a pitch circle diameter and guides the needle roller is not less than 60% of a length in the axial direction of the needle roller.