To improve a read image quality by driving a motor at an appropriate initial Duty.

A motor controller includes: a control unit which applies an initial power for starting the moving of a conveyance target to start the rotation of the motor; a position operating section which obtains the position of the conveyance target based on the signal output corresponding to the rotation of the motor and obtains the position of the conveyance target after the motor is controlled so as to move the conveyance target to a target position; and a correcting section which corrects the initial power to be used at starting the moving of the conveyance target corresponding to the difference between the target position and the conveyance target position thus obtained.