The present invention provides a generator with which a high-frequency alternating current power can be easily obtained even if the rotational speed of the rotor is low and the outer diameter thereof can be appropriately reduced. The rotor 40 has a plurality of magnets 48 whose magnetic poles are alternately different in the circumferential direction, the stator 38 has a stator core 50 and the armature coils 60, the stator core 50 has a first stator salient pole portion disposed between a first groove and an adjacent first groove in a circumferential direction, and a second salient pole portion disposed between a first groove and an adjacent first groove in the other circumferential direction. A first state in which the magnetic poles of the magnets opposing both the first salient pole portion and the second salient pole portion are different, and a second state in which the magnetic poles of the magnets corresponding to both the first Pole pole portion and the second salient pole pole portion which are inverting the magnetic poles of the first state are switched alternately.