A method of manufacturing an impeller for a centrifugal rotating machine that is approximately disk-shaped and has flow passages disposed between a plurality of blades , each of the plurality of blades being formed in a shape that curves to one side thereof in the circumferential direction along the radial direction with a first curved surface on a first side of the blade and a second curved surface on a second side of the blade , and being disposed in a radial manner from the inner circumferential side to the outer circumferential side, the method comprising: a first flow passage formation step (S2) that forms a first region on the outer circumferential side within the flow passage by inserting a first electrode of a shape corresponding to the flow passage with an electric discharge machining method from the outer circumferential side of the disk-shaped body having an outer shape of an impeller, and a second flow passage formation step (S3) that forms a second region on the inner circumferential side within the flow passage from the inner circumferential side of the disk-shaped body, wherein in the first flow passage formation step, using the first electrode which has a first curved face with a curve that corresponds to the second curved surface of the blade and a second curved face with a curve that corresponds to the first curved surface of the blade , characterized in that a curvature radius (R ) of the second curved surface of the blade is more than a curvature radius (R ) of the first curved face of the first electrode , a curvature radius of the second curved face (R ) of the first electrode is more than a curvature radius (R ) of the first curved surface of the blade . a first flow passage formation step (S2) that forms a first region on the outer circumferential side within the flow passage by inserting a first electrode of a shape corresponding to the flow passage with an electric discharge machining method from the outer circumferential side of the disk-shaped body having an outer shape of an impeller, and a second flow passage formation step (S3) that forms a second region on the inner circumferential side within the flow passage from the inner circumferential side of the disk-shaped body, wherein in the first flow passage formation step, using the first electrode which has a first curved face with a curve that corresponds to the second curved surface of the blade and a second curved face with a curve that corresponds to the first curved surface of the blade , characterized in that a curvature radius (R ) of the second curved surface of the blade is more than a curvature radius (R ) of the first curved face of the first electrode , a curvature radius of the second curved face (R ) of the first electrode is more than a curvature radius (R ) of the first curved surface of the blade . in the first flow passage formation step, using the first electrode which has a first curved face with a curve that corresponds to the second curved surface of the blade and a second curved face with a curve that corresponds to the first curved surface of the blade , characterized in that a curvature radius (R ) of the second curved surface of the blade is more than a curvature radius (R ) of the first curved face of the first electrode , a curvature radius of the second curved face (R ) of the first electrode is more than a curvature radius (R ) of the first curved surface of the blade . <EOS>