Semiconductor light-emitting device

A semiconductor light-emitting device comprising:

• a package having a light outlet;
• a semiconductor laser diode disposed in the package and radiating a light having a first wavelength falling within a range of ultraviolet ray to visible light, the semiconductor laser diode being held, through its top and bottom surfaces, between a couple of heat sinks each having a tapered structure;
• and
• a visible-light-emitter containing a phosphor which absorbs a light radiated from the semiconductor laser diode and emits visible light having a second wavelength differing from the first wavelength, said visible-light-emitter being disposed on an optical path of the semiconductor laser diode.