A laser range finder 100 includes: a light source 10 emitting light from a linear light-emitting portion 10a with making a divergent angle of the light larger in a transversal direction of the light-emitting portion 10a than in a longitudinal direction thereof; an objective lens 30 projecting the light onto a target object and converging reflection light; a partial reflection member 20 disposed between the light source and the objective lens and having a partial reflection surface 21 composed of a transmitting area 21a transmitting light emitted from the light source and receiving areas 21b reflecting reflection light; and a photodetector 40 detecting the reflection light reflected by the receiving areas; wherein the light source and the partial reflection member are disposed with making the longitudinal direction of the light-emitting portion 10a disposed substantially perpendicular to a longitudinal direction of the transmitting area 21a as seen along an optical axis.