Patent ID: 8708569

Claim:
A wheel rolling bearing device in which an inner-side inner ring raceway surface and an outer-side inner ring raceway surface are formed at a predetermined interval in an axial direction on an outer peripheral surface of a hub spindle of a hub wheel to which a wheel is connected, an inner-side outer ring raceway surface and an outer-side outer ring raceway surface are formed at a predetermined interval in the axial direction on an inner peripheral surface of an outer ring member arranged on an outer periphery of the hub spindle, inner-row balls are rollably arranged between the inner-side inner ring raceway surface and the inner-side outer ring raceway surface, outer-row balls are rollably arranged between the outer-side inner ring raceway surface and the outer-side outer ring raceway surface, wherein: a pitch diameter of the inner-row balls is less than a pitch diameter of the outer-row balls; an angle of a raceway circular arc measured from a contact point of each inner-row ball with the inner-side outer ring raceway surface to an outer-side edge of the inner-side outer ring raceway surface is less than an angle of a raceway circular arc measured from a contact point of each outer-row ball with the outer-side outer ring raceway surface to an inner-side edge of the outer-side outer ring raceway surface, and the contact point of each inner-row ball with the inner-side outer ring raceway surface diametrically opposes the contact point of each outer-row ball with the outer-side outer ring raceway surface.