Abstract: A sleeve for a fluid-dynamic bearing is manufactured by molding to obtain a molded part, degreasing the molded part to obtain a degreased part, and sintering the degreased part. The molding includes placing a resin core having protrusions on an outer circumference thereof for transferring and forming dynamic-pressure generating grooves on the sleeve into a mold having a cavity corresponding to a shape of the sleeve, and injecting a molding material prepared by mixing a binder and metal or ceramic powders. The degreasing includes preparatory degreasing the molded part to remove a portion of the binder, and further degreasing the molded part, from which the portion of the binder is removed, by heating the molded part in a sintering furnace to thermally decompose the residual portion of the binder and the core. The sintering includes further heating the degreased part to sinter the metal powders or the ceramic powders.