To provide a dynamic-pressure bearing device that does not require coating of plating, a solid lubricating film or the like, and has high abrasion resistance and long service life, and to provide its processing method.

A dynamic-pressure bearing sleeve 1 is formed by impregnating resin 10 into a material formed by baking raw material mainly containing graphite excellent in sliding characteristic to be porous. The sleeve inner surface 1a of the resin 10 after the impregnation (a) is cut on a processing condition where temperature exceeding the highest temperature of the sleeve in using of a predetermined dynamic-pressure bearing is applied to the processed surface, and the sleeve inner surface 1a is finished to a desired dimension (b). The resin section 10a cut or ground in an expanded state by heat in cutting has a more recessed surface than an exposed section of the graphite following reduction of the temperature (c), and does not project from the sleeve inner surface 1a even by temperature increase in the operation of the dynamic-pressure bearing device.