DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0064] Hereinbelow, the present invention is described in detail by way of embodiments thereof illustrated in the accompanying drawings. [0065] (Embodiment 1) [0066]FIGS. 2A and 2B are a plan view and its sectional view taken along the line 2B-2B, respectively, of an AlGaInP based semiconductor light-emitting device which is a first embodiment of t