To solve the problem that it is not easy to calculate transfer function of a state from the shaft of a rotating driving source to the surface of a rotor.

Assuming that a radius of a rotor 1505 is r and static transmission rate from shaft of the rotating driving source 1501 to a state of a shaft of a rotor 1505 is Nb, the method is regarded as the state of the shaft of the rotating driving source 1501 by multiplying the surface state of the rotor 1505 detected a state detection device having a marker sensor 1509 detecting a marker 1508 by 1/(r×Nb), and performs the feedback control of the rotating driving source 1501 on the basis of a difference between the state of the shaft and the target value of the state of the shaft of the rotating driving source 1501.