To realize a structure for easily performing work for meshing mutual first and second both face splines 21a and 26a and capable of making the axis of a hub body 8a coincide with the axis of an outer ring 2a for a constant velocity universal joint based on the fact of meshing mutual these first and second both face splines 21a and 26a.

The first face spline 21a is formed as a partial conical spline concentric with the hub body 8a. The second face spline 26a is formed as a partial conical spline inclined by the same angle in the same direction as the first face spline 21a. The problem is solved by adopting such a constitution.

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