A light source section (1) that emits linearly polarized laser light; a light guide (12) that is shaped as a rectangular parallelepiped whose one main surface has a mirror array (12c) thereon, the mirror array (12c) having formed thereon a plurality of reflecting surfaces that totally reflect the laser light incident on an incident surface (12a), of the light guide, perpendicular to the one main surface and emit the laser light from an emitting surface (12b), of the light guide, perpendicular to the one main surface, the reflecting surfaces being formed in a stepped manner; and a light-guiding plate (3) that makes the laser light, emitted from the light guide (12), incident on an incident surface (3a) of the light-guiding plate and emits the laser light from an emitting surface (3b) of the light-guiding plate, are provided.