Patent ID: 7826331

Claim:
An optical pickup device, comprising in a casing: a projection optical system that projects a light flux outputted from a light source to an optical disk for recording or reproducing information; a light receiving optical system that converges the light flux reflected on the optical disk on a light receiving element to form an image; and a parallel flat plate shaped light flux separating unit that separates the light flux advancing in the light receiving optical system from the light flux advancing in the projection optical system, wherein the light flux separating unit has at least two parts of two surfaces opposed to each other that are respectively fixed to attaching parts provided in a floor surface side of the casing and a wall surface side vertical thereto by two kinds of adhesive agents whose hardness is respectively different after curing, the adhesive agent for fixing the one surface of the light flux separating unit to the floor surface side of the casing has the hardness after curing higher than that of the adhesive agent for fixing the other surface of the light flux separating unit to the wall surface side vertical to the floor surface.