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