Abstract: A semiconductor light-emitting device exhibits high reflectance even with less number of pairs of light-reflecting layers, and allows light emitted from the active layer to be effectively extracted outside. This semiconductor light-emitting device is fabricated at good mass productivity by a semiconductor light-emitting device manufacturing method including the step of providing an active layer which generates light having a specified wavelength on a semiconductor substrate. On the semiconductor substrate, are stacked an AlxGa1−xAs layer and the active layer, in this order. Part of the AlxGa1−xAs layer with respect to the is changed into an AlOy layer (where y is a positive real number).