BEARING DEVICE FOR WHEEL, AND MANUFACTURING METHOD THEREFOR

PROBLEM TO BE SOLVED: To provide a bearing device for a wheel in which backlash in circumferential direction can be suppressed, and a hub ring and an outer ring of a constant velocity universal joint are made possible to be firmly and easily coupled.SOLUTION: A convex part 35 extending in axis direction toward an axial part 12 of a joint outer ring is arranged, and the axial part 12 is press-fitted into a hole 22 of a hub ring 1. By this press fitting, on a bore diameter surface of the hub ring 1, a concave part 36, closely fitting into a convex part 35, is formed by the convex part 35, and a concavo-convex fitting structure M, in which whole areas of the fitting parts of the convex part 35 and the concave part 36 are closely fitted, is constituted. Further, out of the convex part 35, a circle passing through a halfway point of distance from a circle C1 passing through a boundary part, between the area fitting into the concave part 36 and the area not fitting into the concave part 36, to a top part 41a of the convex part 35, is made as the pitch circle, and on this pitch circle, an angle 1, formed by a radial direction line R and a side face 35b of the convex part 35, is set to satisfy a relation of 0°≤ 1≤45°, and when the pitch circle diameter of the convex part 35 is made as PCD, and the number of the convex parts is made as Z, they are set to satisfy a relation of 0.30≤PCD/Z≤1.0.