<p>An optical head is provided with a first light source for radiating light having a first wavelength; a beam splitter for splitting the light radiated from the first light source into a first luminous flux and a second luminous flux traveling in a first direction and a second direction different from the first direction, respectively; a first collimating lens for converting exitance of the first luminous flux; a first mirror for changing the traveling direction of the first luminous flux, the exitance of which is converted; a first objective lens for converging the first luminous flux, the traveling direction of which is changed, on a recording plane of a first optical disc; a movable body for holding the first objective lens; a first light detector which receives the first luminous flux reflected on the recording plane of the first optical disc and converts it into electric signals; a light collecting lens for collecting the second luminous flux; and a second light detector which receives the second luminous flux collected by the light collecting lens and converts it into electric signals.</p>
