Patent ID: 7114854

Claim:
A thrust roller bearing, comprising: a plurality of needle rollers; and a cage for holding each said needle roller in a respective pocket for accommodating said needle roller, the cage having an upper member and a lower member for sandwiching said needle roller between them; wherein the upper member and the lower member are subjected to caulking and are fixed to each other at a radially inner end portion and a radially outer end portion of each of them; wherein a roller holding portion provided in said pocket has a length less than a length of said needle roller, and within a range of 30% to 80% of a length in a radial direction of said pocket; wherein a flat portion having a height less than that of the roller holding portion, measured in a cross-section perpendicular to a plane along which the cage extends, is provided between the radially inner and outer end portions of the cage and an end portion of said needle roller; and wherein said pocket extends to the flat portion.