An electric motor comprising: a motor magnet in which a plurality of magnetic poles are arranged in a circumferential direction; a rotating shaft that is rotatably provided inside the motor magnet; an armature core that is mounted on the rotating shaft and includes a plurality of teeth radially extending outward in a radial direction and a plurality of slots formed between the teeth; coils (91, 92, 93) that are wound on each of the teeth in a concentrated winding manner; a commutator which is provided so as to rotate integrally with the rotating shaft and on which a plurality of segments are disposed in the circumferential direction; and an anode brush (21a, 21b) and a cathode brush that supply power to the coils (91, 92, 93) through the segments, wherein three coils (91, 92, 93) are wound on each of the teeth, characterized in that the three coils (91, 92, 93) are an advance-angle coil which is short-circuited by the commutator segments when the respective tooth is at an advance angle of θ1 relative to the direct axis of a magnetic pole of the said motor magnet, a delay-angle coil which is short circuited by the commutator segments when the respective tooth is at a delay angle of θ2 relative to the direct axis of a magnetic pole of the said motor magnet, and a 0°-angle coil which is short-circuited by the commutator segments when the respective tooth is at an angle of 0° relative to the direct axis of a magnetic pole of the said motor magnet, and the electric motor satisfies the following conditions: 0 ° < θ 1 ≤ 20 °, 0 ° < θ 2 ≤ 20 °, 0 ° ≤ θ 3 ≤ 3 °, and T 2 > T 1 > T 3, or the electric motor satisfies the following conditions: 0 ° < θ 1 ≤ 20 °, 0 ° < θ 2 ≤ 20 ° 3 ° ≤ θ 3 ≤ 10 °, and T 2 > T 3 > T 1 or the electric motor satisfies the following conditions: 0 ° < θ 1 ≤ 20 °, 0 ° < θ 2 ≤ 20 °, θ 3 = 20 °, and T 3 > T 2 > T 1 where θ3: an advance angle of the anode brush (21a, 21b) relative to the direct axis of a magnetic pole of the said motor magnet; T1: the number of turns of the advance-angle coil; T2: the number of turns of the 0°-angle coil; and T3: the number of turns of the delay-angle coil. a motor magnet in which a plurality of magnetic poles are arranged in a circumferential direction; a rotating shaft that is rotatably provided inside the motor magnet; an armature core that is mounted on the rotating shaft and includes a plurality of teeth radially extending outward in a radial direction and a plurality of slots formed between the teeth; coils (91, 92, 93) that are wound on each of the teeth in a concentrated winding manner; a commutator which is provided so as to rotate integrally with the rotating shaft and on which a plurality of segments are disposed in the circumferential direction; and an anode brush (21a, 21b) and a cathode brush that supply power to the coils (91, 92, 93) through the segments, wherein three coils (91, 92, 93) are wound on each of the teeth, characterized in that the three coils (91, 92, 93) are an advance-angle coil which is short-circuited by the commutator segments when the respective tooth is at an advance angle of θ1 relative to the direct axis of a magnetic pole of the said motor magnet, a delay-angle coil which is short circuited by the commutator segments when the respective tooth is at a delay angle of θ2 relative to the direct axis of a magnetic pole of the said motor magnet, and a 0°-angle coil which is short-circuited by the commutator segments when the respective tooth is at an angle of 0° relative to the direct axis of a magnetic pole of the said motor magnet, and the electric motor satisfies the following conditions: 0 ° < θ 1 ≤ 20 °, 0 ° < θ 2 ≤ 20 °, 0 ° ≤ θ 3 ≤ 3 °, and T 2 > T 1 > T 3, or the electric motor satisfies the following conditions: 0 ° < θ 1 ≤ 20 °, 0 ° < θ 2 ≤ 20 ° 3 ° ≤ θ 3 ≤ 10 °, and T 2 > T 3 > T 1 or the electric motor satisfies the following conditions: 0 ° < θ 1 ≤ 20 °, 0 ° < θ 2 ≤ 20 °, θ 3 = 20 °, and T 3 > T 2 > T 1 where θ3: an advance angle of the anode brush (21a, 21b) relative to the direct axis of a magnetic pole of the said motor magnet; T1: the number of turns of the advance-angle coil; T2: the number of turns of the 0°-angle coil; and T3: the number of turns of the delay-angle coil.