To provide a wheel bearing device having improved durability by preventing creep while attaining lightweighting, compactifying, and cost reduction.

In the wheel bearing device having the first-generation structure which includes a wheel bearing 2 for bearing a wheel to be rotatable, a hub ring 1 is formed with a fitted part 10 into which the wheel bearing 2 is pressed and a positioning part 11 which is gradually reduced in inner diameter from the fitted part 10 toward one end of a base part 4 of the hub ring 1, on an inner circumferential surface of the base part 4 of the hub ring 1, where the another end being the press-in entrance, and an outer ring 15 of the wheel bearing 2 is formed with an outer diameter surface part 15b, a small diameter surface part 15c formed in a slightly small diameter in comparison with the diameter of the outer diameter surface part 15b, and a positioning part 30 which is gradually reduced in inner diameter via the small diameter surface part 15c, on an end part of an outer circumference surface of the outer ring 15. These positioning parts 11, 30 each have a tapered surface of an inclined angle θ in a range of 5 to 45 degrees, and the base part 4 of the hub ring 1 and the outer ring 15 of the wheel bearing 2 are mutually fitted along the tapered surfaces to position the outer ring 15 in the axial direction with respect the hub ring 1.