The opening portion at the side of inner ring 10 formed at {TAIL ~ the edge portions} of two holding surfaces 16 adjacent in the circumferential direction is smaller in {HEAD ~ size} in the circumferential direction than the diameter of ball 12 
The opening portion at the side of inner ring 10 formed at { TAIL ~ the edge portions } of two holding surfaces 16 adjacent in the circumferential direction is smaller in { HEAD ~ size } in the circumferential direction than the diameter of ball 12
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH