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A cover (8) of an optical device (10) is divided into: a first cover (5) which is fixed to a side wall section (4) so that an optical window (52) covers a light receiving section (1a) that serves as an effective region of an LCOS element (1); and a second cover (6) which is fixed to the side wall section (4) and the first cover (5) so as to cover an electrode terminal (3) and a wire (7) that connects the electrode terminal (3) and the semiconductor element (1b) to each other.