Provided is a monitor for monitoring the condition of the interior of a living organism from the surface of the living organism. The monitor is provided with: a probe which includes an observation window and is attached to the organism surface； a unit which irradiates, with a laser, at least a portion of an observation region； a unit which detects scattered light resulting from the laser irradiation； a Doppler analysis unit and a SORS analysis unit which narrow down the observation spots to a first observation spot； and a CARS analysis unit which obtains the optical spectrum for at least one component, and outputs first information indicating the condition of the organism interior on the basis of the intensity of the spectrum.
