Trace control apparatus and optical disc apparatus

The present invention discloses a tracking control apparatus, a signal processing unit (140), the lens position characteristic measuring section (162), and obtains the optimal position of the lens unit (164). The signal processing unit (140) to obtain an optical disc (110) of the first address and the second address. Lens position characteristic measurement unit (162) sequentially generated by a regulator (23) that the focusing means (22) at a position spaced a given distance from the offset value is set to move in the focusing lens (22) of the respective position on the number of times the first address and the second address obtained by counting the joint. Optimal lens position calculating part (164) is determined to obtain the maximum number of addresses, the offset value is set according to the maximum number to obtain, through the regulator (23) so that the condenser lens (22) moves. Even without using the phase difference tracking error signal, there is no phase difference adjusting circuit means, or with a simple optical pickup split photodetector, lens movement can also be zero.