<p>An optical head device includes: light source means for emitting a laser beam for each of a plurality of types of optical discs; a first objective lens for collecting the laser beam emitted from the light source means onto a recording surface of one type of optical disc and a second objective lens for collecting the laser beam onto a recording surface of the other type of optical disc; one light reception element for receiving a signal light from the recording surface; and an optical system for performing a polarization process or non-polarization process on the laser beam or the signal light according to the optical disc type so as to introduce the laser beam into the first or the second objective lens in accordance with the optical disc type and introduce the signal light into the light reception element. The polarization process is a light synthesis or light separation depending on the polarization state and the non-polarization process is light synthesis or light separation not depending on the polarization state.</p>
