Tripod constant velocity universal joint

The invention provides a tripod type constant velocity universal joint which can stabilize the position of a retainer ring in the axial direction of a foot shaft in an annular groove without worsening the assembling property of the retainer ring in the annular groove, and can manage a gap between an outer washer and a roller pin with high precision. A retainer ring (14) for restricting the movement of the outer washer (12) toward the shaft end side of the foot shaft is attached to an annular groove (11) formed in the outer peripheral surface of the foot shaft (8) of the tripod member (5). The retainer ring (14) is pressed against the annular groove (11) by the elastic force of the retainer ring (14). A tapered surface (11c), the diameter of which increases toward the foot shaft root side, is provided in a region closer to the foot shaft root side than a cylindrical surface (11a) that is the smallest diameter section in the annular groove (11). 本发明提供能够不使挡圈向环状槽的组装性恶化地使挡圈在环状槽内的脚轴轴线方向的位置稳定而高精度地管理外垫圈与滚针之间的间隙的三球销型等