Abstract: Provided is a bearing device capable of suppressing corrosion for a long time. The bearing device is for use in a wiper arm to pivotably attach a retainer to an arm head. The bearing device includes an outer bushing press-fitted into a hinge portion of the arm head, an inner bushing rotatably inserted into a bore in the outer bushing, and a rivet inserted into a bore in the inner bushing to secure the retainer and the inner bushing together integrally. Thus, a hinge portion of the retainer, the inner bushing, and the rivet are pivotable relative to the hinge portion of the arm head and the outer bushing. The outer bushing has an inside bushing part and an outside bushing part provided around the outer periphery of the inside bushing part and joined to the inside bushing part. The joint surface of the inside bushing part and the joint surface of the outside bushing part are joined to each other by interatomic bonding. The outside bushing part is formed of the same material as that of the arm head.

Abstract: Provided is a bearing device capable of suppressing corrosion for a long time. The bearing device is for use in a wiper arm to pivotably attach a retainer to an arm head. The bearing device includes an outer bushing press-fitted into a hinge portion of the arm head, an inner bushing rotatably inserted into a bore in the outer bushing, and a rivet inserted into a bore in the inner bushing to secure the retainer and the inner bushing together integrally. Thus, a hinge portion of the retainer, the inner bushing, and the rivet are pivotable relative to the hinge portion of the arm head and the outer bushing. The outer bushing has an inside bushing part and an outside bushing part provided around the outer periphery of the inside bushing part and joined to the inside bushing part. The joint surface of the inside bushing part and the joint surface of the outside bushing part are joined to each other by interatomic bonding. The outside bushing part is formed of the same material as that of the arm head.