To provide a motor in which vibration and noise are suppressed.

In a motor 3 comprising a rotor magnet 31, a stator 32 and a bearing mechanism 50, greatest common measure of the number of magnetic poles 31a of the rotor magnet 31 and the number of teeth 32a of the stator 32 is set larger than the number of driving phases. Furthermore, the number of radial dynamic pressure generation grooves or thrust dynamic pressure generation grooves is set not to coincide with the measure nor the multiple of the number of poles (magnetic poles) of a rotor magnet and the number of teeth of a stator.