An automotive rotary electric machine comprising: a rotor that is disposed inside a casing (2, 3) so as to be fixed to a shaft that is rotatably supported by said casing (2,3); a stator comprising: a stator core; and a stator winding that is mounted onto said stator core, said stator being supported by said casing (2, 3) so as to surround said rotor; a rectifier that rectifies alternating-current electric power that is generated by said stator winding, said rectifier being fixed to said casing (2, 3) so as to be disposed outside a first axial end of said casing; a voltage regulator that adjusts magnitude of an alternating-current voltage that is generated by said stator, said voltage regulator being disposed outside said first axial end of said casing (2, 3); a resin protective cover that is formed so as to have a cup shape that is constituted by a bottom portion and a tubular peripheral wall portion, and that is mounted to said casing (2, 3) so as to cover said rectifier and said voltage regulator; a mounting bolt that is inserted through a penetrating aperture that is formed on said bottom portion of said protective cover and that is fixed to a portion of said casing (2, 3) at said first axial end; said automotive rotary electric machine being characterized in comprising; a resin harness clamp that fixes electrical wiring, and a metal mounting device (33, 33A) that is fixed to a portion of said mounting bolt that projects out through said penetrating aperture, said harness clamp being held by said metal mounting device (33, 33A). a rotor that is disposed inside a casing (2, 3) so as to be fixed to a shaft that is rotatably supported by said casing (2,3); a stator comprising: a stator core; and a stator winding that is mounted onto said stator core, said stator being supported by said casing (2, 3) so as to surround said rotor; a stator core; and a stator winding that is mounted onto said stator core, said stator being supported by said casing (2, 3) so as to surround said rotor; a rectifier that rectifies alternating-current electric power that is generated by said stator winding, said rectifier being fixed to said casing (2, 3) so as to be disposed outside a first axial end of said casing; a voltage regulator that adjusts magnitude of an alternating-current voltage that is generated by said stator, said voltage regulator being disposed outside said first axial end of said casing (2, 3); a resin protective cover that is formed so as to have a cup shape that is constituted by a bottom portion and a tubular peripheral wall portion, and that is mounted to said casing (2, 3) so as to cover said rectifier and said voltage regulator; a mounting bolt that is inserted through a penetrating aperture that is formed on said bottom portion of said protective cover and that is fixed to a portion of said casing (2, 3) at said first axial end; said automotive rotary electric machine being characterized in comprising; a resin harness clamp that fixes electrical wiring, and a metal mounting device (33, 33A) that is fixed to a portion of said mounting bolt that projects out through said penetrating aperture, a mounting bolt that is inserted through a penetrating aperture that is formed on said bottom portion of said protective cover and that is fixed to a portion of said casing (2, 3) at said first axial end; a metal mounting device (33, 33A) that is fixed to a portion of said mounting bolt that projects out through said penetrating aperture, said harness clamp being held by said metal mounting device (33, 33A).