An automotive alternator comprising: a rotor rotatably supported in a bracket (1,2); and a stator provided with a cylindrical stator core in which a plurality of slots extending axially are formed circumferentially and a stator winding installed in said stator core, said stator being supported in said bracket so as to surround an outer circumference of said rotor, wherein said slots are formed in said stator core at a ratio of two per phase,per pole, wherein said stator winding is provided with two three-phase alternating-current windings, each of said three-phase alternating-current windings being constructed by forming three single-phase winding portions, respectively, (30,30A,30B,47) installed in said slots into an alternating-current connection, said three single-phase winding portions of a first one of the two three-phase alternating-current windings having output wires a, b, c and neutral-point lead wires; said three single-phase winding portions of a second one of the two three-phase alternating-current windings having output wires a', b', c' and neutral-point lead wires; characterized in that each of said single-phase winding portions (30,30A,30B,47) is constructed by installing a conductor wire such that winds of said conductor wire extend outwards from first and second ends of said slots, are divided onto first and second circumferential sides, and enter slots on said first and second circumferential sides, wherein each of said three-phase alternating-current windings is constructed by forming said three single-phase winding portions (30,30A,30B,47) of the respective three-phase alternating-current winding into a Y-connection, wherein the slots out of which the neutral-point lead wires of said three single-phase winding portions are led, and the slots out of which the output wires of said single-phase winding portions are led, are disposed to constitute a sequence in circumferential direction of leading out the output wires a followed by b followed by three slots from which the neutral-point lead wires of the phases a, b and c are led out followed by c followed by a' followed by three slots from which the neutral-point lead wires of the phases a', b', c' are led out followed by b' followed by c'. a rotor rotatably supported in a bracket (1,2); and a stator provided with a cylindrical stator core in which a plurality of slots extending axially are formed circumferentially and a stator winding installed in said stator core, said stator being supported in said bracket so as to surround an outer circumference of said rotor, wherein said slots are formed in said stator core at a ratio of two per phase,per pole, wherein said stator winding is provided with two three-phase alternating-current windings, each of said three-phase alternating-current windings being constructed by forming three single-phase winding portions, respectively, (30,30A,30B,47) installed in said slots into an alternating-current connection, said three single-phase winding portions of a first one of the two three-phase alternating-current windings having output wires a, b, c and neutral-point lead wires; said three single-phase winding portions of a second one of the two three-phase alternating-current windings having output wires a', b', c' and neutral-point lead wires; characterized in that each of said single-phase winding portions (30,30A,30B,47) is constructed by installing a conductor wire such that winds of said conductor wire extend outwards from first and second ends of said slots, are divided onto first and second circumferential sides, and enter slots on said first and second circumferential sides, wherein each of said three-phase alternating-current windings is constructed by forming said three single-phase winding portions (30,30A,30B,47) of the respective three-phase alternating-current winding into a Y-connection, wherein the slots out of which the neutral-point lead wires of said three single-phase winding portions are led, and the slots out of which the output wires of said single-phase winding portions are led, are disposed to constitute a sequence in circumferential direction of leading out the output wires a followed by b followed by three slots from which the neutral-point lead wires of the phases a, b and c are led out followed by c followed by a' followed by three slots from which the neutral-point lead wires of the phases a', b', c' are led out followed by b' followed by c'.