Constant velocity universal joint and manufacturing method of constant velocity universal joint

A constant velocity universal joint comprising:

• an outer joint member formed in a bottomed cylindrical shape having an opening portion on one side in an axial direction and a bottom portion on another side in the axial direction, and having a plurality of outer retaining grooves formed along a circumferential direction on an inner periphery that has a concave inner spherical surface;
• an inner joint member disposed on an inner side of the outer joint member, and having a plurality of inner retaining grooves formed along the circumferential direction on an outer periphery that has a convex outer spherical surface;
• a plurality of retaining members that rolls in the outer retaining grooves and the inner retaining grooves, respectively, and transmits torque between the outer joint member and the inner joint member;
• and
• a cage that is formed in an annular shape and is disposed between the concave inner spherical surface of the outer joint member and the convex outer spherical surface of the inner joint member, and in which a plurality of window portions respectively accommodating the retaining members is formed in the circumferential direction, wherein the inner joint member includes
• a holding portion that has a bottomed concave shape, and into which a sleeve that supports a boot covering the opening portion is press-fitted on the opening portion side of the outer joint member, and
• a relief portion that is provided on part of the convex outer spherical surface on the opening portion side and that has a smaller diameter than an outer diameter of the convex outer spherical surface, corresponding to a press-fitting range in which the sleeve is press-fitted into the holding portion.