To provide a rotor of variable magnetic flux magnet type, excellent in reliability and simpler and more compact than a conventional one.

Fixed rotors 3 and 4 of magnet type fixed to a rotating shaft 2 are provided with a relative rotation mechanism relatively rotating a movable rotor 5 by centrifugal force which is the magnet type rotor engaged rotatably with the rotating shaft 2. The relative rotation mechanism comprises a guide groove having a spiral groove, and a guide member that moves in it under a centrifugal force. The guide member is energized inward in radial direction by a spring. Thus, the relative angle between the fixed rotors 3 and 4 and the movable rotor 5 is changed according to changes in rotational speed during electric operation, so that a synthesized magnetic flux amount is changed.

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