An optical disk apparatus (P7) for reproducing a signal (Sd) from a recording track formed in an optical disk (1) by focusing a light spot (Ls) on said recording track includes a calibration data generator (220). The calibration data generator (220) having a plurality of a ROMs (300) storing various calibration patterns (SP and SR) for causing said reproduced signal (Sd) to jitter. A calibration data recording controller (210) control the calibration data generator (220) to selectively output a specific calibration pattern (SP) to the optical pickup unit (Os) to record said specific pattern (SP) to a calibration data track area (23) of the optical disk (1).
