Patent ID: 8356943

Claim:
A bearing device for a wheel, comprising: a hub wheel; a double-row roller bearing; a constant velocity universal joint, the hub wheel, the double-row roller bearing, and the constant velocity universal joint being unitized together; and a recess-projection fitting structure through intermediation of which the hub wheel and a shaft section of an outer joint member of the constant velocity universal joint are separably coupled with each other, the shaft section being inserted in a fitting manner into a hole portion of the hub wheel, wherein the recess-projection fitting structure comprises: projecting portions provided on one of an outer surface of the shaft section of the outer joint member and an inner surface of the hole portion of the hub wheel and extending in an axial direction, the projecting portions being press-fitted along the axial direction into another of the outer surface of the shaft section of the outer joint member and the inner surface of the hole portion of the hub wheel; and recessed portions formed with the projecting portions so as to be held in close contact with the projecting portions in a fitting manner on the another of the outer surface of the shaft section of the outer joint member and the inner surface of the hole portion of the hub wheel, the projecting portions and the recessed portions being held in close contact with each other through intermediation of an entire region of fitting contact regions therebetween, the recess-projection fitting structure allowing separation by being applied with a pulling-out force in the axial direction.