A light source unit of a light source device for an endoscope, which makes it possible to improve light use efficiency regarding illumination light without upsizing an optical system, includes: a solid-state light emitting element for emitting light from a light emitting surface； and a cover member that covers the solid-state light emitting element such that the cover member is spaced apart from the light emitting surface. In this configuration, the cover member includes a reflective surface that reflects light emitted from the light emitting surface, and an opening from which light is emitted.
