To provide a reflecting optical coupler with converging lenses capable of ensuring easy cleaning on the front face of a cover.

A light emitting element 20a and a light receiving element 20b are sealed in a body 10 formed of a shading resin. A cover 30 is fitted into the body 10 to be located on the front faces of the light emitting element 20a and the light receiving element 20b. Converging lenses 31a, are formed on the cover 30 corresponding to the light emitting element 20a and the light receiving element 20b. The converging lenses 31a, 31b are formed as convex lenses which have flat surfaces 32a, 32b on the front face sides and spherically protruded surfaces 33a, 33b on the element sides.