Method for manufacturing hub ring and method for manufacturing vehicle bearing apparatus

A method for manufacturing a vehicle bearing apparatus, the vehicle bearing apparatus including a hub ring, an inner ring body, an outer ring member, rolling elements, and a seal member, the hub ring including a flange portion, a shaft body portion, a step surface, and a seal facing surface, the flange portion including bolt holes, an outer surface, and bolts, wherein the flange portion is formed on an outer periphery of the shaft body portion, and the outer surface forms a surface of the flange portion on a vehicle outer side in an axle direction, the method comprising:

• press-fitting the bolts into the bolt holes, respectively;
• forming a reference surface in the shaft body portion by performing grinding on the seal facing surface, the reference surface being orthogonal to the axle direction;
• performing machining on the outer surface by using the reference surface as a reference after the bolts are press-fitted into the bolt holes, respectively, wherein machining is applied to the outer surface with reference to the reference surface in a state in which the shaft body portion is supported by a rotation device, the flange portion contacts a turning device, and the seal facing surface contacts a backup device, after the bolts are press-fitted into the bolt holes, wherein the seal facing surface contacts the backup device for support and is not machined by the backup device;
• and
• disposing the inner ring body so that the inner ring body abuts on the step surface of the hub ring in the axle direction, disposing the seal member in a portion facing the seal facing surface, and disposing the rolling elements and the outer ring member around an outer periphery of the inner ring body and the shaft body portion.