Abstract: Both end portions in an axial direction of a hub 8b are supported by a supporting portion of a working apparatus rotatably centering on a center axis of the hub 8b and in a state of restraining a displacement thereof in a radial direction. Further, before removing the hub 8b from the supporting portion from the state, an outer side face 28 of an attaching flange 13 and a first inner ring track 14 are worked to predetermined shapes. Thereby, judder in braking is prevented from being brought about by promoting a perpendicularity of the outer side face 28 of the attaching flange 13 provided to the hub 8b relative to a rotational center of the hub 8b and restraining a deflection of a rotor coupled to fix to the outer side face 28.