An electric motor, comprising: a stator (160, 360); and a rotor (180, 380) having a rotating shaft (185, 385) and a permanent magnet (190, 390) at an outer circumferential portion thereof and rotatably disposed at a preset gap from the stator (160, 360); wherein the permanent magnet (190, 390) comprises: a first magnet (191, 391) provided with a plurality of first magnetic pole portions (193a, 393a) and a plurality of second magnetic pole portions (193b, 393b) each having a plurality of opposite magnetic poles and alternately arranged along a circumferential direction, and polar-anisotropically magnetized such that the plurality of magnetic poles form a magnetic field in the gap; and a plurality of second magnets (201, 411, 511, 611, 711) each having magnetic flux stronger than that of the first magnet (191, 391) and spaced apart from the gap relative to the first magnet (191, 391), and wherein a central portion of each of the second magnets (201, 411, 511, 611, 711) is disposed at a boundary between the first magnetic pole portion (193a, 393a) and the second magnetic pole portion (193b, 393b) adjacent to each other, characterised in that the first magnet includes a plurality of second magnet inserting portions formed at an inner circumferential portion of the first magnet so that the plurality of the second magnets be inserted into the plurality of second magnet inserting portions and be mounted on the plurality of second magnet inserting portions, each of the plurality second magnets has an outer circumferential surface formed in an arc shape, and a thickness between an outer circumferential surface of the first magnet and the outer circumferential surface of each of the plurality of the second magnets is constantly maintained in a circumferential direction. a stator (160, 360); and a rotor (180, 380) having a rotating shaft (185, 385) and a permanent magnet (190, 390) at an outer circumferential portion thereof and rotatably disposed at a preset gap from the stator (160, 360); wherein the permanent magnet (190, 390) comprises: a first magnet (191, 391) provided with a plurality of first magnetic pole portions (193a, 393a) and a plurality of second magnetic pole portions (193b, 393b) each having a plurality of opposite magnetic poles and alternately arranged along a circumferential direction, and polar-anisotropically magnetized such that the plurality of magnetic poles form a magnetic field in the gap; and a plurality of second magnets (201, 411, 511, 611, 711) each having magnetic flux stronger than that of the first magnet (191, 391) and spaced apart from the gap relative to the first magnet (191, 391), and wherein a central portion of each of the second magnets (201, 411, 511, 611, 711) is disposed at a boundary between the first magnetic pole portion (193a, 393a) and the second magnetic pole portion (193b, 393b) adjacent to each other, characterised in that the first magnet includes a plurality of second magnet inserting portions formed at an inner circumferential portion of the first magnet so that the plurality of the second magnets be inserted into the plurality of second magnet inserting portions and be mounted on the plurality of second magnet inserting portions, each of the plurality second magnets has an outer circumferential surface formed in an arc shape, and a thickness between an outer circumferential surface of the first magnet and the outer circumferential surface of each of the plurality of the second magnets is constantly maintained in a circumferential direction. a first magnet (191, 391) provided with a plurality of first magnetic pole portions (193a, 393a) and a plurality of second magnetic pole portions (193b, 393b) each having a plurality of opposite magnetic poles and alternately arranged along a circumferential direction, and polar-anisotropically magnetized such that the plurality of magnetic poles form a magnetic field in the gap; and a plurality of second magnets (201, 411, 511, 611, 711) each having magnetic flux stronger than that of the first magnet (191, 391) and spaced apart from the gap relative to the first magnet (191, 391), and wherein a central portion of each of the second magnets (201, 411, 511, 611, 711) is disposed at a boundary between the first magnetic pole portion (193a, 393a) and the second magnetic pole portion (193b, 393b) adjacent to each other, characterised in that the first magnet includes a plurality of second magnet inserting portions formed at an inner circumferential portion of the first magnet so that the plurality of the second magnets be inserted into the plurality of second magnet inserting portions and be mounted on the plurality of second magnet inserting portions, each of the plurality second magnets has an outer circumferential surface formed in an arc shape, and a thickness between an outer circumferential surface of the first magnet and the outer circumferential surface of each of the plurality of the second magnets is constantly maintained in a circumferential direction.