PURPOSE: To facilitate manufacturing and attachment by partially designing fixing elements projecting over an outer ring on both front surfaces of an outer cage ring and attaching protrusions having radially outward formed cams on the ends.

CONSTITUTION: In inserting and attaching, a double cage having a lower radial protrusion 20 is inserted and centered in the front part of a conical extended part 36 of a freewheel outer ring 18. Next, the double cage is pressed into the outer ring 18. In this case, the protrusion 20 is compressed inward in the radial direction, and a plastic-made outer cage ring 12 is elastically deformed. At the end of insertion, a high radial protrusion 22 reaches a joining position at the front side 32 on the inserting side of the outer ring 18, the lower protrusion 20 outwardly elastically acts in the radial direction in which it acts as a catch element, and it is coincided with the front side 32 on the opposite side.