A shift range controller includes a target speed setter that sets a target motor speed for a motor based on an angle deviation between a current rotation position of the motor and a target rotation position based on a requested shift range. A requested duty calculator calculates a requested duty as a drive control amount for driving the motor based on the target motor speed. The target speed setter receives a feedback of the requested duty, and changes the target motor speed at a deceleration time based on the feedback of the requested duty. By changing the target motor speed based on the requested duty, the target motor speed is optimized for responding to impediment-causing factors such as temperature and friction. In such manner, the shift range switching responsiveness is improved.