The invention provides a method of processing an inner surface of a bearing having a cylindrical shape which bearing includes a resin layer composed mainly of a synthetic resin as the inner surface, the method improving roughness of the inner surface and dimensional accuracy of an inner diameter of the bearing without cutting the inner surface. The inner frame provides rigidity and strength to the door assembly and will not warp or otherwise lose its dimensional integrity regardless of the environment or usage. Communication services may include telephone service, television service, Internet service, and other services delivered via a network. The divided polygon includes the vertex that has not been moved and vertexes of the voxel inside the shape data. Finally, the switch S3 is turned off and the switch S4 is turned on, thus the switching of the MR head is finished. With the two races between the formed end and the shoulder.