A method for manufacturing an interior permanent magnet rotor unit that includes a core having a plurality of insertion holes arranged in a circumferential direction (Dc) of the core and permanent magnets embedded in the insertion holes of the core, the rotor unit or a plurality of the rotor units being coupled in an axial direction of the core to form a rotor, the method comprising: magnetizing a magnet material filling the insertion holes by using a magnetizing device; wherein the magnetizing device includes an axial magnetizing part serving as a source of a magnetic field and a radial magnetizing part having an inner peripheral surface that faces the core in a radial direction of the core; the axial magnetizing part has a circular cylindrical shape; and the radial magnetizing part is formed by alternately arranging low magnetic permeability portions and high magnetic permeability portions having higher magnetic permeability than the low magnetic permeability portions in a circumferential direction of the radial magnetizing part, characterized in that in the magnetizing, the radial magnetizing part is disposed so that the low magnetic permeability portions face the magnet materials in the radial direction of the core, the axial magnetizing part is disposed so as to face the radial magnetizing part in the axial direction of the core, and the axial magnetizing part applies the magnetic field toward the radial magnetizing part to apply the magnetic field to the magnet materials via the radial magnetizing part, wherein an inner peripheral surface of the axial magnetizing part has a diameter equal to or larger than a diameter of the core; and in the magnetizing, the inner peripheral surface of the axial magnetizing part is disposed so as to coincide with an outer peripheral surface of the core or so as to be located outside the outer peripheral surface of the core in the radial direction of the core. magnetizing a magnet material filling the insertion holes by using a magnetizing device; wherein the magnetizing device includes an axial magnetizing part serving as a source of a magnetic field and a radial magnetizing part having an inner peripheral surface that faces the core in a radial direction of the core; the axial magnetizing part has a circular cylindrical shape; and the radial magnetizing part is formed by alternately arranging low magnetic permeability portions and high magnetic permeability portions having higher magnetic permeability than the low magnetic permeability portions in a circumferential direction of the radial magnetizing part, characterized in that in the magnetizing, the radial magnetizing part is disposed so that the low magnetic permeability portions face the magnet materials in the radial direction of the core, the axial magnetizing part is disposed so as to face the radial magnetizing part in the axial direction of the core, and the axial magnetizing part applies the magnetic field toward the radial magnetizing part to apply the magnetic field to the magnet materials via the radial magnetizing part, wherein an inner peripheral surface of the axial magnetizing part has a diameter equal to or larger than a diameter of the core; and in the magnetizing, the inner peripheral surface of the axial magnetizing part is disposed so as to coincide with an outer peripheral surface of the core or so as to be located outside the outer peripheral surface of the core in the radial direction of the core.