Abstract: An object of the present invention is to provide an adhesive composition for a polarization-maintaining optical fiber exhibiting a high extinction ratio. The adhesive composition for a polarization-maintaining optical fiber of the present invention contains: a compound (A) having an aromatic ring and a reactive silicon-containing group; a glycidyl compound (B); and a compound (C) having a silsesquioxane ladder structure.

Abstract: An electronic device includes a circuit board on which an electronic component is mounted and a ground pattern surrounding the electronic component is formed, a shield case which is formed by drawing a mesh material formed by weaving a conductive wire, stores the electronic component, and has a box-like room with a peripheral portion for ground around an open end, and a housing which incorporates the circuit board and shield case and has a rib formed at a predetermined position on the inner surface in order to bring the peripheral portion into press contact with the ground pattern.