Optical waveguide, optical waveguide module, and electronic apparatus

A light guide comprising a core made of a material having translucency and a clad made of a material having an index of refraction different from an index of refraction of the core and surrounding a periphery of the core, a light incident surface and a light exit surface, which are end faces of the core and the clad, being formed as inclined surfaces so that an orthogonal projection to a plane orthogonal to an extending direction of the light guide has a rectangular shape and being inclined at a predetermined angle in a direction of moving away from the end face, a light applied from a light source being introduced into the core by being reflected at the light incident surface and a light transmitted through the core being exit to outside by being reflected at the light exit surface;

• wherein
• at least one of the light incident surface or the light exit surface of the core is arranged while shifted in parallel without changing respective inclined angles so that the inclined surface is divided into a plurality of inclined surfaces parallel in a longitudinal direction of the rectangular shape in the orthogonal projection and the plurality of inclined surfaces closer to the light source are positioned in a direction of moving away from the end face to be in a shape extending in the direction of moving away from the end face in a stepwise manner as a whole.