A windshield wiper motor comprising: - a reduction mechanism including an output shaft configured to drive a wiper apparatus of a vehicle; and - a motor configured to drive the reduction mechanism, wherein the motor comprises: • a yoke formed in a bottomed cylindrical shape; • four permanent magnets arranged at equal intervals in a circumferential direction on an inner circumferential surface of the yoke so that magnetic poles thereof are alternatively arranged each other; • an armature comprising: • a rotary shaft rotatably journaled to the yoke; • an armature core attached to the rotary shaft and having eighteen teeth; • a commutator attached to the rotary shaft and having a plurality of segments with the same number of the teeth of the armature core, wherein the plurality of the segments are insulated each other; • an armature coil including a plurality of winding wires being wound around a predetermined teeth of the armature core and being connected to the adjacent segments of the commutator; and • a plurality of connecting wires each of which connected to the segments arranged so as to face each other about the rotary shaft, wherein the armature is housed inside the yoke so as to be surrounded by the four permanent magnets, and • a first brush, a second brush, and a third brush (21c, 21a, 21b) each of which come into slidably contact with the segments of the commutator, wherein the first brush and the second brush are arranged 90 degrees apart from each other substantially, wherein the third brush is arranged at a position which is advanced from positions which face each other about the rotary shaft of the second brush, wherein the first brush is connected to a common potential, wherein an electric current for rotating the armature in a low-speed is selectively supplied to the second brush, wherein an electric current for rotating the armature in a high-speed is selectively supplied to the third brush, and wherein while the second brush comes into sliding contact with a first segment of the commutator, the third brush is arranged at a position which does not come into sliding contact with a first equipotential segment which becomes the same potential with respect to the first segment. - a reduction mechanism including an output shaft configured to drive a wiper apparatus of a vehicle; and - a motor configured to drive the reduction mechanism, • a yoke formed in a bottomed cylindrical shape; • four permanent magnets arranged at equal intervals in a circumferential direction on an inner circumferential surface of the yoke so that magnetic poles thereof are alternatively arranged each other; • an armature comprising: • a rotary shaft rotatably journaled to the yoke; • an armature core attached to the rotary shaft and having eighteen teeth; • a commutator attached to the rotary shaft and having a plurality of segments with the same number of the teeth of the armature core, wherein the plurality of the segments are insulated each other; • an armature coil including a plurality of winding wires being wound around a predetermined teeth of the armature core and being connected to the adjacent segments of the commutator; and • a plurality of connecting wires each of which connected to the segments arranged so as to face each other about the rotary shaft, wherein the armature is housed inside the yoke so as to be surrounded by the four permanent magnets, and • a rotary shaft rotatably journaled to the yoke; • an armature core attached to the rotary shaft and having eighteen teeth; • a commutator attached to the rotary shaft and having a plurality of segments with the same number of the teeth of the armature core, wherein the plurality of the segments are insulated each other; • an armature coil including a plurality of winding wires being wound around a predetermined teeth of the armature core and being connected to the adjacent segments of the commutator; and • a plurality of connecting wires each of which connected to the segments arranged so as to face each other about the rotary shaft, • a first brush, a second brush, and a third brush (21c, 21a, 21b) each of which come into slidably contact with the segments of the commutator,