Multi-channel spectrophotometer and data processing method for multi-channel spectrophotometer

The present invention addresses the problem of reducing the influence of stray light incident on each of a plurality of light reception elements when the light reception elements are used to receive light of various wavelengths. A multi-channel spectrophotometer according to the present invention is provided with: a multi-channel detector (17) that introduces light from a sample into a spectral element (16), carries out wavelength dispersion on the light using the spectral element (16), and detects, at once, the resulting wavelength dispersion light, said multi-channel detector being provided with a plurality of light reception elements (PD) disposed one-dimensionally along the wavelength dispersion direction of the spectral element (16); a light amount calculation unit (221) for calculating wavelength dispersion light amounts from the detection signals of the plurality of light reception elements (PD); a spectrum creation unit (222) for creating a spectrum indicating the relationship between wavelengths and