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.
