Light-receiving device

A light-receiving device comprising:

• a light guide plate that is a transparent member having a first surface and a second surface as principal surfaces opposed to each other, and that has an emission surface formed on at least one end;
• a lens sheet that has a structure in which a plurality of lenses are arranged and is disposed opposite to the first surface;
• a support member that supports the lens sheet in such a way that a distance between a principal surface of the lens sheet and the second surface is equal to a focal distance of the plurality of lenses;
• a directional light-guide layer that is disposed on the second surface of the light guide plate and guides, toward the emission surface, a travel direction of an optical signal entering an inside of the light guide plate;
• an optical receiver that receives the optical signal emitted from the emission surface of the light guide plate and converts the received optical signal into an electric signal;
• and
• a polarization element including a wavelength plate that converts an optical signal of circularly polarized light into linearly polarized light and a polarization plate that uniforms a polarization direction of an optical signal converted by the wavelength plate into linearly polarized light, wherein
• the polarization element is disposed on an upper side of the lens sheet, and
• the directional light-guide layer is a hologram layer that guides, toward the optical receiver, the optical signal of linearly polarized light having a polarization direction in a predetermined direction.