Provided is a movable body spectrum measuring apparatus, which can discriminate a measuring object with high precision by photographic data from a spectrum sensor mounted on a movable body such as a vehicle and can process the photographic data in real time. A movable body spectrum measuring apparatus discriminates the measuring object around a vehicle on the basis of the spectrum data from an observation light. A spectrum sensor can measure wavelength information and light intensity information. The movable body spectrum measuring apparatus comprises a dictionary data storing unit storing, as dictionary data, the spectrum data containing the wavelength information and the light intensity information regarding a plurality of predetermined measuring objects, and an arithmetic device for discriminating the measuring object on the basis of comparison computation to compare the spectrum data of the observation light and the spectrum data stored in the dictionary data storing unit. The arithmetic device performs the computation to compare the spectrum data of the observation light with reference to only a partial wavelength band of the spectrum data stored as the dictionary data.