The invention comprises: a laser light source 11; a light-transmission-side lens 12 that shapes a laser beam L emitted from the laser light source 11 into a dot shape; a scanner 13 that projects the dot-shaped laser beam L while scanning the same in a horizontal direction X and a perpendicular direction Y of a measurement-target area A; a light-reception-side lens 16 that receives reflected light R reflected from the measurement-target area A; a light-reception-side optical system 17 that gathers, in both the horizontal direction X and the perpendicular direction Y, the reflected light R received by the light-reception-side lens 16; a light reception element 18 that receives the reflected light R gathered by the light-reception-side optical system 17; and an information generating unit 21 that generates three-dimensional information of the measurement-target area A on the basis of a reception signal outputted by the light reception element 18.