A method of manufacturing a rotor to be used for forming a steam turbine, the method comprising: a step of reducing the residual stress of predetermined target regions of the rotor relative to the other region, wherein the step of reducing the residual stress includes a tempering step of tempering the rotor at a tempering temperature, the tempering temperature being a heating temperature of the target regions which is set to be higher than that of the other region in the tempering step; and a step of refining crystal grains in the target regions relative to the other region, wherein the step of refining crystal grains includes: a quenching step of quenching the rotor at an austenitizing temperature prior to the tempering step, the austenitizing temperature being a heating temperature of the target regions is set to be lower than that of the other region in the quenching step wherein the austenitizing temperature of the other regions is set to be within the range of 910 to 950 °C and the austenitizing temperature of the target regions is set to be within the range of 880 to 910 °C; and a pre-quality heat treatment annealing step that is to be executed prior to the quenching step, wherein a pre-quality heat treatment annealing temperature being a heating temperature for the pre-quality heat treatment annealing step is set to be within a range of 1,050°C to 1,300°C; wherein the rotor is made of a ferritic alloy steel containing, in mass%, carbon: 0.15 % to 0.33 %, silicon(Si): 0.03 % to 0.20 %, manganese(Mn): 0.5 % to 2.0 %, nickel(Ni): 0.1 % to 1.3 %, chromium(Cr): 0.9 % to 3.5 %, molybdenum(Mo): 0.1 % to 1.5 %, vanadium: 0.15 % to 0.35 %, tungsten as optional component: 1.0 % or less, and nitrogen as optional component: 0.005 % to 0.15 %, the remaining balance is iron(Fe) and unavoidable impurities. a step of reducing the residual stress of predetermined target regions of the rotor relative to the other region, wherein the step of reducing the residual stress includes a tempering step of tempering the rotor at a tempering temperature, the tempering temperature being a heating temperature of the target regions which is set to be higher than that of the other region in the tempering step; and a step of refining crystal grains in the target regions relative to the other region, wherein the step of refining crystal grains includes: a quenching step of quenching the rotor at an austenitizing temperature prior to the tempering step, the austenitizing temperature being a heating temperature of the target regions is set to be lower than that of the other region in the quenching step wherein the austenitizing temperature of the other regions is set to be within the range of 910 to 950 °C and the austenitizing temperature of the target regions is set to be within the range of 880 to 910 °C; and a pre-quality heat treatment annealing step that is to be executed prior to the quenching step, wherein a pre-quality heat treatment annealing temperature being a heating temperature for the pre-quality heat treatment annealing step is set to be within a range of 1,050°C to 1,300°C; a quenching step of quenching the rotor at an austenitizing temperature prior to the tempering step, the austenitizing temperature being a heating temperature of the target regions is set to be lower than that of the other region in the quenching step wherein the austenitizing temperature of the other regions is set to be within the range of 910 to 950 °C and the austenitizing temperature of the target regions is set to be within the range of 880 to 910 °C; and a pre-quality heat treatment annealing step that is to be executed prior to the quenching step, wherein a pre-quality heat treatment annealing temperature being a heating temperature for the pre-quality heat treatment annealing step is set to be within a range of 1,050°C to 1,300°C; wherein the rotor is made of a ferritic alloy steel containing, in mass%, carbon: 0.15 % to 0.33 %, silicon(Si): 0.03 % to 0.20 %, manganese(Mn): 0.5 % to 2.0 %, nickel(Ni): 0.1 % to 1.3 %, chromium(Cr): 0.9 % to 3.5 %, molybdenum(Mo): 0.1 % to 1.5 %, vanadium: 0.15 % to 0.35 %, tungsten as optional component: 1.0 % or less, and nitrogen as optional component: 0.005 % to 0.15 %, the remaining balance is iron(Fe) and unavoidable impurities.