An inner-ring restraint device of a hub bearing capable of restraining an inner ring efficiently without applying a load to the hub bearing. An inner-ring restraint device includes a restraint ring allowing a plurality of pieces to be arranged to form a ring shape and restricting an inner ring of a hub bearing by reducing a diameter, a support plate having a ring shape coaxial with the hub bearing, being provided so as to move in an axial direction and supporting the restraint ring at a position closer to the hub bearing for the vehicle than the restraint ring in the axial direction and a ring-shaped operation plate connected to the support plate so as to relatively move in the axial direction and applying a pressure in a direction of reducing the diameter to the restraint ring by coming relatively close to the support plate.

An inner-ring restraint device of a hub bearing capable of restraining an inner ring efficiently without applying a load to the hub bearing. An inner-ring restraint device includes a restraint ring allowing a plurality of pieces to be arranged to form a ring shape and restricting an inner ring of a hub bearing by reducing a diameter, a support plate having a ring shape coaxial with the hub bearing, being provided so as to move in an axial direction and supporting the restraint ring at a position closer to the hub bearing for the vehicle than the restraint ring in the axial direction and a ring-shaped operation plate connected to the support plate so as to relatively move in the axial direction and applying a pressure in a direction of reducing the diameter to the restraint ring by coming relatively close to the support plate.

A method of manufacturing a rolling bearing unit for supporting a wheel includes detecting a current value flowing through an electric motor (19) configured to drive a roll (22) and determining a time to terminate a caulking process on the basis of the detected value when a caulking section (13) is formed by pressing the roll (22), inclined with respect to a central axis of a hub main body (7) and supported in a rotatable state about a central axis of the roll, against a cylindrical section (12), installed on an inner end portion of the hub main body (7) in the axial direction, while the roll (22) is rotated about the central axis of the hub main body (7).

A method of manufacturing a rolling bearing unit for supporting a wheel includes detecting a current value flowing through an electric motor (19) configured to drive a roll (22) and determining a time to terminate a caulking process on the basis of the detected value when a caulking section (13) is formed by pressing the roll (22), inclined with respect to a central axis of a hub main body (7) and supported in a rotatable state about a central axis of the roll, against a cylindrical section (12), installed on an inner end portion of the hub main body (7) in the axial direction, while the roll (22) is rotated about the central axis of the hub main body (7).