Optical device and method of manufacturing optical device

An optical device, comprising:

• an optical element that is rectangular as seen in a top view, and that has a light-receiving portion at a top surface thereof;
• a wiring substrate on which the optical element is mounted;
• wires electrically connecting the optical element and the wiring substrate at from one to three sides of the rectangular optical element;
• a resin portion formed at a periphery of the optical element, and covering a portion of the top surface of the optical element including the wires;
• and
• an opening portion that is concave, that is provided in the resin portion, and that is formed by a molding die such that at least the light-receiving portion and the top surface at a periphery of the light-receiving portion are exposed,
• wherein the resin portion that structures a bottom surface at the opening portion is flush with the top surface,
• wherein a through-portion, which passes through the resin portion and exposes a surface of a portion of the wiring substrate, is provided at a portion of the opening portion, and
• a light-emitting element is provided at the wiring substrate that is exposed from the through-portion.