The device is constructed by an optical waveguide having an incident port for receiving incidence of energy lights from plural systems, an inner reflection surface which is a closed surface provided from the incident port to the rear thereof and an irradiation port formed on the rear end part of the inner reflection surface for irradiating the energy lights and an optical fiber disposed on the rear side of this optical waveguide for receiving incidence of the energy lights irradiated from this irradiation port. Thus, it is possible to couple energy lights from plural systems in single focus without needing any precise arrangement of optical elements.