A method for manufacturing a tubular rotary component from a metal disc with a hole formed in a central portion thereof, the metal disc having a predetermined inside diameter (D 1) and a predetermined outside diameter (D 2), the method comprising: an intermediate molding step comprising subjecting the metal disc to a reaming-drawing process in which both surfaces of the metal disc are pressed in entirety by a tapered surface of a punch (10A, 10A1, 10A2, 10B) having a predetermined taper and a tapered surface of a die (20A, 20A1, 20A2, 20B) having a matching taper with the taper of the punch (10A, 10A1, 10A2, 10B), thereby producing an intermediate molded article (100A,100A1,100A2) having a frustoconical shape; and a final molding step comprising subjecting the intermediate molded article (100A,100A1,100A2) to a further reaming-drawing process in which the intermediate molded article (100A,100A1,100A2) is pressed by a punch (10A, 10A1, 10A2, 10B) and a (20A, 20A1, 20A2, 20B) die having a smaller taper angle than the punch (10A, 10A1, 10A2, 10B) and the die (20A, 20A1, 20A2, 20B) for use in the intermediate molding step, respectively, thereby manufacturing the tubular rotary component, characterized in that the metal disc is made of a metal plate as a material, the metal plate containing inclusions that are unevenly distributed such that a quantity of the inclusions increases toward a midpoint of a plate thickness of the metal plate, wherein the method further comprises a cutting process step comprising subjecting the tubular rotary component obtained through the final molding step to a cutting process, wherein the tubular rotary component has a thickness in which a partial thickness from a midpoint of the thickness to an inside diameter-side surface of the tubular rotary component is defined as an inside diameter-side thickness, while a partial thickness from the midpoint of the thickness to an outside diameter-side surface of the tubular rotary component is defined as an outside diameter-side thickness, and wherein the cutting process is performed such that an inside diameter-side residue ratio becomes 0.37 or greater and an outside diameter-side residue ratio becomes 0.49 or greater, the inside diameter-side residue ratio being a ratio of the inside diameter-side thickness after the cutting process to the inside diameter-side thickness before the cutting process, and the outside diameter-side residue ratio being a ratio of the outside diameter-side thickness after the cutting process to the outside diameter-side thickness before the cutting process. an intermediate molding step comprising subjecting the metal disc to a reaming-drawing process in which both surfaces of the metal disc are pressed in entirety by a tapered surface of a punch (10A, 10A1, 10A2, 10B) having a predetermined taper and a tapered surface of a die (20A, 20A1, 20A2, 20B) having a matching taper with the taper of the punch (10A, 10A1, 10A2, 10B), thereby producing an intermediate molded article (100A,100A1,100A2) having a frustoconical shape; and a final molding step comprising subjecting the intermediate molded article (100A,100A1,100A2) to a further reaming-drawing process in which the intermediate molded article (100A,100A1,100A2) is pressed by a punch (10A, 10A1, 10A2, 10B) and a (20A, 20A1, 20A2, 20B) die having a smaller taper angle than the punch (10A, 10A1, 10A2, 10B) and the die (20A, 20A1, 20A2, 20B) for use in the intermediate molding step, respectively, thereby manufacturing the tubular rotary component, characterized in that the metal disc is made of a metal plate as a material, the metal plate containing inclusions that are unevenly distributed such that a quantity of the inclusions increases toward a midpoint of a plate thickness of the metal plate, wherein the method further comprises a cutting process step comprising subjecting the tubular rotary component obtained through the final molding step to a cutting process, wherein the tubular rotary component has a thickness in which a partial thickness from a midpoint of the thickness to an inside diameter-side surface of the tubular rotary component is defined as an inside diameter-side thickness, while a partial thickness from the midpoint of the thickness to an outside diameter-side surface of the tubular rotary component is defined as an outside diameter-side thickness, and wherein the cutting process is performed such that an inside diameter-side residue ratio becomes 0.37 or greater and an outside diameter-side residue ratio becomes 0.49 or greater, the inside diameter-side residue ratio being a ratio of the inside diameter-side thickness after the cutting process to the inside diameter-side thickness before the cutting process, and the outside diameter-side residue ratio being a ratio of the outside diameter-side thickness after the cutting process to the outside diameter-side thickness before the cutting process.