To provide a motor which is made free of a resonance sound source and a vibration exciting force in rotation.

After a permanent magnet 11 which is not magnetized is mounted on a magnetizing yoke and magnetized by feeding a half-wave magnetizing current to a magnetizing coil arranged on the magnetizing yoke, the magnetized surface 12 or opposite surface of the permanent magnet 11 is heated by a heating means 16 at equal intervals by as many times as a multiple (n) (n: integer larger than or equal to one) of the number of magnetizing poles, to substantially remove (n)th-order higher harmonics of magnetic flux density waveform generated on the inner peripheral surface of the permanent magnet 11.