Provided is a monitor (10) for monitoring the condition of the interior of a living organism from the surface of the living organism. The monitor (10) is provided with: a probe (23) which includes an observation window (21) and is attached to the organism surface (2)； a unit (25) which irradiates, with a laser, at least a portion of an observation region (3) on the organism surface (2) accessed via the observation window (21)； a unit (27) which detects scattered light (28) resulting from the laser irradiation from each of a plurality of observation spots distributed two-dimensionally throughout the observation region (3)； a Doppler analysis unit (51) and a SORS analysis unit (52) which, on the basis of the scattered light (28) obtained from the plurality of observation spots, narrow down the plurality of observation spots to a first observation spot for which it is determined that scattered light including information on a target section of the organism interior can be obtained； and a CARS analysis unit (53) which obtains the optical spectrum for at least one component from the first observation spot or observation spots surrounding the same, and outputs first information indicating the condition of the organism interior on the basis of the intensity of the spectrum.
