In a motor-driven shift position switching device, when the difference between
a target position and the rotation position of a rotor has become smaller than
a prescribed value in a motor feedback control, a transition is made to a deceleration
control. A phase lead correction amount for correcting the phase lead of the current
supply phase with respect to the rotor rotation phase is set in accordance with
the rotor rotation speed. Thus, proper braking force suitable for the rotor rotation
speed is exerted on the rotor and the rotor can be decelerated smoothly as it approaches
the target position. Further, in the period when the current supply to the motor
is kept off, the shift position switching determination ranges are set wider than
in the period when the current supply to the motor is on.