Provided is an inexpensive and small-sized rotating electric machine that can function as a generator without complicated control or device. The rotating electric machine includes a stator having a plurality of stator teeth; a rotor having a plurality of rotor teeth; and a multi-phase armature winding (125) and an exciting winding which are disposed to the stator teeth. The rotating electric machine has a diode bridge (310) for rectifying an induced voltage induced by the multi-phase armature winding; and a capacitor (321) connected in series to the multi-phase armature winding respectively.