Optical pickup apparatus and optical disk apparatus

An optical disk apparatus, comprising:

• disk rotational driving means for driving an optical disk, on which a wobbled groove track and a land track having land prepits representative of position information of the track, to rotate;
• and
• an optical pickup for recording and/or reproducing information onto and/or from the optical disk, said optical pickup including a light source for emitting a beam of light of a predetermined wavelength, an objective lens for condensing the beam of light emitted from said light, a light reception section having areas divided in parallel to a tangential direction to the track for receiving returning light of the beam of light reflected back from the optical disk and outputting signals corresponding to amounts of the received light by the areas, a control section for performing gain control of the signals for the individual areas outputted from said light reception section in the wobbling frequency or a frequency equal to an integral number of times of the wobbling frequency, and a production section for producing a signal corresponding to one of the land prepits based on the signals for the individual areas having the gains controlled by said control section.