A semiconductor light-emitting device (A) having a simple configuration whereby it is possible to easily and accurately confirm whether or not ultraviolet light is being emitted, the semiconductor light-emitting device comprising: a semiconductor light-emitting element (1) for emitting ultraviolet light in an ultraviolet or deep ultraviolet region; a cap part (6) having a through-hole (63) in the top part through which ultraviolet light passes and encircling the semiconductor light-emitting element (1); a translucent cover (7) for transmitting ultraviolet light, the translucent cover being disposed so as to hermetically close up the through-hole (63); and a UV-excited phosphor (8) which is excited by ultraviolet light and which emits visible light, the UV-excited phosphor being disposed inside the cap part (6).