A display device includes: a light source unit that outputs laser light; a light-guide optical system that forms a plurality of optical paths of the laser light; an optical path switch element that switches an optical path of the laser light to any one of the plurality of optical paths; an optical member that forms a single optical path in a subsequent stage of the plurality of optical paths; and a projection mirror that forms a projection image to be projected on a screen by scanning the laser light that passed through the single optical path. The plurality of optical paths includes an optical path for low luminance and an optical path for high luminance which make the laser light have different luminance. The optical path switch element is disposed on an optical path between the light source unit and the projection mirror.