Patent ID: 8614938

Claim:
An objective lens unit, comprising: a first light source; a second light source; a first objective lens; a second objective lens; a lens holder for supporting the first objective lens and the second objective lens; an actuator for driving the lens holder; and a detector; wherein: the lens holder includes a first through-hole through which light incident on the first objective lens passes and a second through-hole through which light incident on the second objective lens passes, light emitted by the first light source is collected on a data recording face of a first optical disc, light emitted by the second light source is collected on a data recording face of a second optical disc, the first objective lens and the second objective lens are arranged in a direction perpendicular to a tracking direction of the optical disc, an interval between an optical axis of the first objective lens and an optical axis of the second objective lens is 2.5 mm or greater and 5 mm or less, and the actuator for driving the lens holder is provided with at least one electromagnetic driving element on each of both end faces of the lens holder, the end faces being located along the direction in which the first objective lens and the second objective lens are arranged.