An optical disk apparatus includes a printed circuit board; a stator fixed on the printed circuit board; a rotor configured to receive an optical disk thereon, the rotor being rotated by an electromagnetic interaction with the stator; and a sensing part fixed on the printed circuit board and sensing a rotation of the optical disk. Here, the sensing part includes a sensor; a terminal connecting the sensor with the printed circuit board electrically; and a plastic mold fixing the terminal thereto. The optical disk apparatus has a reduced number of components to allow reduced production costs, and has a simple manufacturing process to allow reduced production times and defect rate.