The present invention aims to provide a light source for illumination that achieves excellent luminous intensity distribution and can be easily assembled. A light source 1 comprises a mount 20; a plurality of semiconductor light-emitting elements 12 disposed on an upper surface 22 of the mount 20 so that each light-emitting element emits light primarily upward; and a reflector 80 disposed above the semiconductor light-emitting elements 12 and having a reflective surface 85 configured to reflect a portion of primary light from the light-emitting elements 12 obliquely downward so that the portion of the primary light is prevented from striking the upper surface 22 of the mount 20, wherein the reflector 80 is provided with an opening 86 or a cut for leaking another portion of the primary light upward.