An optical measurement device provided with: a first adjustment optical device for collecting radiation light received by a probe that emits measurement light to a measurement target and receives radiation light radiated from the measurement target, and for emitting the radiation light toward the spectroscope for dividing the radiation light； a detection section for detecting a light intensity distribution of the radiation light； a movement part for moving the first adjustment optical device in a light axis direction of the radiation light and on a plane perpendicular to the light axis direction of the radiation light； and a control section for controlling the movement part. The first adjustment optical device is moved in the light axis direction of the radiation light and on the plane on a basis of a detection result of the detection section such that a reception amount of the radiation light increases.
