An alternating current generator having a first Y-form three-phase connecting circuit including three first windings connected with each other in a Y-form, a first rectifying circuit for rectifying currents output from output terminals of the three first windings, a second Y-form three-phase connecting circuit including three second windings connected with each other in a Y-form, and a second rectifying circuit for rectifying currents outputted from output terminals of the three second windings. The three first windings are inserted in slots of a stator core so that the three first windings have phase differences of approximately 120 degrees from each other. Each of the three second windings is divided into first and second winding portions which are inserted in separate slots of the stator core, in which the three first windings are inserted so that resultant output vectors of the respective two divided windings have respective phase differences of approximately 30 degrees with respect to output vectors of the respective three first windings. By virtue of the above-mentioned structure, the number of slots in the stator core is reduced, the ripple contained in a resultant output waveform is decreased by adding together output currents of the first and second rectifying circuits, respectively, and heat generation due to a circulating current flowing in the connecting circuits can be prevented by avoiding the use of a delta-form three-phase connecting circuit.