The aligning ball bearing has two kinds of structure, such as the cylindrical hole and the conical hole, and the material of the retainer is made of steel plate, synthetic resin, etc.. The outer ring spherical raceway, the mind is automatically adjusted, can compensate the error caused by the concentricity and deflection, but the inner and outer rings is not more than 3 degrees inclination. The aligning ball bearing has two kinds of structure, such as the cylindrical hole and the conical hole, and the material of the retainer is made of steel plate, synthetic resin, etc.. The outer ring spherical raceway, the mind is automatically adjusted, can compensate the error concentricity and deflection made self-aligning ball bearings into the inner and outer rings, but shall not exceed 3 degrees relative gradient. Can bear large radial load, but also can bear a certain axial load. This kind of bearing outer ring raceway is spherical shape, it has a self-aligning performance, the axial force bending or tilt of the inner ring and the outer ring center line center line relative inclination of not more than 1 degrees to 2.5 degrees, the bearing can still work.