[PROBLEM];In a caulking process, only a desired portion is plastically deformed, and the portions other than the desired portion are prevented from being deformed.;[MEANS FOR SOLVING THE PROBLEMS];An inner ring 3 is fitted on one-end side of an inner shaft 2 and fixed to the inner shaft by caulking. During the caulking, the inner shaft 2 is supported by a caulking receiving jig U. A receiving section 12 to which the jig U is in contact is provided at a position near the one-end side of the inner shaft 2, for example, at a position nearer to the inner ring 3 than a raceway section 2a formed on the outer periphery on the other side of the inner shaft 2. As a result, a caulking load acting from a caulking jig K on the inner shaft plastically deforms only a desired portion.
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