In an automotive alternator including a rotor having first and second claw-shaped magnetic poles fitted onto a rotating shaft, and a stator having a stator core supported between front-end and rear-end brackets, a stator coil which is connected into a three-phase alternating current connection being wound into the stator core, the stator core includes a core main body constructed by laminating a strip-shaped steel plate, the core main body including a base portion and a plurality of tooth portions protruding radially inwards from the base portion defining core main body slots, and an end plate which is thicker than the steel plate being disposed on at least one end surface of the core main body.