A multicolor detection device includes: a condensing lens array 17 in which a plurality of condensing lenses 18, each of which turns light emitted from each of a plurality of light emitting points 1 individually into parallel light beams, are arranged, the light emitting points being arranged in a light emitting point array; at least one spectroscopic element on which the parallel light beams are incident in parallel, the at least one spectroscopic element being common; and at least one sensor on which light beams spectrally separated by the spectroscopic element are incident in parallel, the at least one sensor being common.