An electric rotating machine (100) comprises a stator(10), an outer rotor (30), and an inner rotor (20), wherein the stator is provided with armature coils (14) which generate mangnetic flow due to connecting electricity; the outer rotor (30) rotates due to the passing through of the magnetic flow; and the inner rotor (20)is configured in the midway of the magnetic path of the magnetic flow passing through the inner rotor and rotates; in the electric rotating machine (100), multiple magnetic cores(32) are arranged along the periphery of the outer rotor, induction coils (34) and excitation coils(35) are enwound on the magnetic cores(32); induced current is generated in the induction coils (34) due to the interlinking of the magnetic flow generated in the armature coils, and magnetic fields are generated in the magnet exciting coils (35) due to the circulation of the induced current; multiple modulation components (21) of the soft magnet are arranged with a specified interval on the periphery on the inner rotor.