Disclosed is a
semiconductor laser light emitting device including: a stacked film composed of a stack of group III
nitride semiconductor films each containing at least one kind selected from aluminum,
gallium,
indium, and
boron; wherein an upper portion of the stacked film is formed into a
ridge-like stripe, to form a current injection region; a current non-injection region formed on both sides of the
ridge-like stripe; and at least part of the current non-injection region is made from a material expressed by a
chemical formula AlxGa1-xN (0≦x≦1.0). In this device, the component ratio “x” of Al is specified at a value in a range of 0.3≦x≦1.0, so that the
semiconductor laser light emitting device is configured as an index guide type semiconductor
laser light emitting device; the component ratio “x” of Al is specified at a value in a range of 0.15<x<0.30, so that the semiconductor
laser light emitting device is configured as a weak index type pulsation semiconductor
laser light emitting device; or the component ratio “x” of Al is specified at a value in a range of 0≦x≦0.15, so that the semiconductor
laser light emitting device is configured as a
gain guide type laser light emitting device.