To provide a bearing unit for wheels 5b capable of preventing perpendicularity of a mounting face 25 from varying with each product and sufficiently promoting reduction in judder occurring in braking.
After each component of this bearing unit for wheels 5b including each stud 9 is assembled, turning work is performed simultaneously on an inner face 32 in the diameter direction from an inscribed circle of the each stud 9 on the mounting face 25 and on an outer face 33 in the diameter direction from a circumscribed circle of the each stud 9, by precise work cutting tools 40a, 40b, respectively. Each time when the turning work is completed, the amounts of deviation of the inner face 32 and the outer face 33 from the same reference plane are measured. Based on the deviation amounts, the positions of the precise work cutting tools 40a, 40b are corrected respectively. As a result, deterioration in the perpendicularity of the mounting face 25 can be prevented and the above problem can be resolved.
SAKAMOTO MITSUYOSHI
Nakai Shun
Kinzo Koyama