To provide a wheel bearing device with reduced manufacturing cost by easily forming a plurality of flange portions, while reducing weight.

This wheel bearing device includes a flanged shaft member 1 having a shaft portion 10 to which a rolling bearing 41 is assembled, a fitting shaft portion 30 fitted with a center hole of a wheel, and a plurality of flange portions 21 extended radially in an outer diameter direction on an outer peripheral surface located between the shaft portion 10 and the fitting shaft portion 30 and penetrated with bolt holes 24 of hub bolts 27. The flange portions 21 are formed by side extrusion when a forged recess 33 is formed at an end face of a center portion of the fitting shaft portion 30 by cold forging. A first chamfering portion 25 is formed at an opening edge on one side of each of the bolt holes 24 on sides in which warpage of the flange portions 21 are directed, while a second chamfering portion 26 is formed at an opening edge on an opposite side. When a chamfering depth of the first chamfering portion 25 is made as T1 and a chamfering depth of the second chamfering portion 26 is made as T2, a relation of "T1<T2" is set.