LIGHT EMITTING DEVICE, MANUFACTURING METHOD, AND WAVEGUIDE STRUCTURE

A light emitting device includes a light source that emits light having a directivity from a light emitting surface of the light source, a waveguide structure that includes an optical waveguide having an inlet facing the light emitting surface, and a peripheral wall protruding from the inlet toward the light emitting surface, and a lens that is provided between the light emitting surface and the inlet. The peripheral wall has an inner surface surrounding the inlet. The peripheral wall has a first opening closer to the light emitting surface and a second opening closer to the inlet. The first opening is larger than the second opening. The peripheral wall includes a narrow opening portion in which an internal space of the peripheral wall is smaller than the lens when viewed from a direction of an optical axis of the light. The inner surface of the peripheral wall includes an inclined surface that inclines so that the internal space becomes narrower as approaching the inlet, at least in the narrow opening portion. The lens is disposed in contact with the narrow opening portion in the internal space of the peripheral wall.