A semiconductor laser apparatus capable of reducing a spread angle of emission light with downsizing has an active region between first and second end surfaces. A first reflection structure and a partial reflection structure are provided on the first end surface side. The end surface of the active region is divided into a total reflection region and a partial reflection region in combination with the first reflection structure and partial reflection structure. A laser resonator includes the first reflection structure and partial reflection structure. A second reflection structure is positioned on the way of a resonance optical path of the laser resonator. Light emitted within the active region propagates on a resonance optical path. An induction emission is produced. The semiconductor laser carries out a laser oscillation. Of the light arriving at the partial reflection structure, the portion transmitted through the partial reflection structure is outputted outside the apparatus.