A method of manufacturing a rotor to be used for forming a steam turbine, the method comprising: a quenching step of quenching the entire rotor at a uniform austenitizing temperature which is set to be within a range of 910 to 950°C; a pre-quality heat treatment annealing step that is to be executed prior to the quenching step, the pre-quality heat treatment annealing step being executed at a temperature within a range of 1,050 to 1,300°C, wherein the pre-quality heat treatment annealing step is executed on the entire rotor; and a step of reducing the residual stress of predetermined target regions of the rotor relative to the other region, wherein the rotor is made of a ferritic alloy steel containing, in mass%, carbon(C): 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(V): 0.15 % to 0.35 % and tungsten (W) as optional component: 1.0 % or less, and nitrogen(N) as optional component: 0.005 % to 0.15 %, the balance being iron(Fe) and unavoidable impurities; and wherein the step of reducing the residual stress includes a tempering step wherein the tempering step includes: a first stage tempering step in which a first stage tempering temperature of the target regions is set to be within a range of 600 to 700°C; a second stage tempering step in which a second stage tempering temperature of the target region is set to be within a range of 600 to 700°C; and wherein at least one of the first and second stage tempering temperatures of the target regions is set to be within a range of 660 to 700°C and higher than that of the other region. a quenching step of quenching the entire rotor at a uniform austenitizing temperature which is set to be within a range of 910 to 950°C; a pre-quality heat treatment annealing step that is to be executed prior to the quenching step, the pre-quality heat treatment annealing step being executed at a temperature within a range of 1,050 to 1,300°C, wherein the pre-quality heat treatment annealing step is executed on the entire rotor; and a step of reducing the residual stress of predetermined target regions of the rotor relative to the other region, wherein the rotor is made of a ferritic alloy steel containing, in mass%, carbon(C): 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(V): 0.15 % to 0.35 % and tungsten (W) as optional component: 1.0 % or less, and nitrogen(N) as optional component: 0.005 % to 0.15 %, the balance being iron(Fe) and unavoidable impurities; and wherein the step of reducing the residual stress includes a tempering step wherein the tempering step includes: a first stage tempering step in which a first stage tempering temperature of the target regions is set to be within a range of 600 to 700°C; a second stage tempering step in which a second stage tempering temperature of the target region is set to be within a range of 600 to 700°C; and wherein a first stage tempering step in which a first stage tempering temperature of the target regions is set to be within a range of 600 to 700°C; a second stage tempering step in which a second stage tempering temperature of the target region is set to be within a range of 600 to 700°C; and wherein at least one of the first and second stage tempering temperatures of the target regions is set to be within a range of 660 to 700°C and higher than that of the other region. <EOS>