Optical disk drive

The present invention provides an optical disc apparatus for reading data from a plurality of optical disk, the optical disk apparatus comprising: a motor rotating the optical disc; at least one light source that emits multiple light beams having different wavelengths; at least one lens, which enables a plurality of light beams focused on the optical disc per bundle; the spherical aberration correcting unit, which can change the state of the spherical aberration of a light beam; an optical disc and a control unit that controls the operation of the motor, a light source, a lens and a spherical aberration correction portion. A control unit having a light source for irradiating the optical disc and the lens mounted on the beam and the disc type discriminating portion discriminating the optical disc. Optical disk discriminating unit based on the signal values ​​obtained from the optical disk by the light beam reflected by the spherical aberration at the time of the spherical aberration correcting unit is set to the state of the light beam and the first state by correcting the spherical aberration in the spherical portion of the light beam the second state is set to signal when the aberration is obtained from the second state of the light beam reflected from the optical disk in the value to be determined.