Abstract: A wheel bearing device includes: an inner shaft including a wheel mounting flange on one side in an axial direction and including double row inner raceway surfaces on the other; an outer ring including double row outer raceway surfaces facing the inner surfaces; a plurality of first balls interposed between a first inner raceway surface located on the one side in the axial direction out of the double row inner raceway surfaces and a first outer raceway surface located on the one side in the axial direction out of the double row outer raceway surfaces; and a plurality of second balls interposed between a second inner raceway surface and a second outer raceway surface. The plurality of first balls and the plurality of second balls have the same diameter. A contact angle of the plurality of first balls is smaller than a contact angle of the plurality of second balls.

Abstract: A manufacturing method of a wheel bearing device, the wheel bearing device including an outer ring member, an inner shaft member that includes a shaft portion that has an inside raceway and a flange portion, a plurality of rolling elements, a seal provided at an end portion of the outer ring member on the first axial side and including an axial lip, and a lip contact surface provided on the side of the inner shaft member and contacted by the axial lip, includes: processing the outside raceway with a distance in an axial direction from a first reference position being managed, a first reference position being set on the outer ring member; and providing the seal at a predetermined position, in the axial direction, of the outer ring member with respect to the first reference position.

Abstract: The wheel bearing device includes a hub shaft including a flange portion on one axial side of the hub shaft, an outer ring, a plurality of rolling elements, a cage, and a seal member attached to an end portion of the outer ring on the one axial side. A side surface of the flange portion on another axial side of the hub shaft includes a first side surface having first roughness and a second side surface having second roughness larger than the first roughness. The seal member includes a lip provided facing the second side surface, and a distal end of the lip includes a worn surface that is worn by being in sliding contact with the second side surface.

Abstract: A manufacturing method of a wheel bearing device, the wheel bearing device including an outer ring member, an inner shaft member that includes a shaft portion that has an inside raceway and a flange portion, a plurality of rolling elements, a seal provided at an end portion of the outer ring member on the first axial side and including an axial lip, and a lip contact surface provided on the side of the inner shaft member and contacted by the axial lip, includes: processing the outside raceway with a distance in an axial direction from a first reference position being managed, a first reference position being set on the outer ring member; and providing the seal at a predetermined position, in the axial direction, of the outer ring member with respect to the first reference position.