To provide a control device and an imaging device, which can set the best control state by optimizing a drive current and an exciting method, in response to the drive state of a motor.

The control device realizes the optimum motor control, in response to the rotational speed by controlling the motor corresponding, to them, by deciding the rotating speed of the motor corresponding to a speed signal c to be imparted from an external unit, switching an exciting method (1/16, 1/8, 1/4, 1/2 and two-phase excitation), corresponding to the rotational speed, and further changing the peak current of the drive current supplied to the motor mode to respond to the rotational speed at each time. The imaging signal of a high quality is obtained, by imaging an object by means of a camera unit installed in the drive device operated by such a control method.