An analysis device that analyzes a target component which is contained in a sample containing one or a plurality of interference components, comprising: a light source that emits modulated light whose wavelength is modulated using a predetermined modulation frequency; a photodetector that detects an intensity of sample light obtained when the modulated light is transmitted through the sample; a logarithmic operation unit that performs a logarithmic operation on light intensity signals obtained by the photodetector , a correlation value calculation unit that calculates sample correlation values which are correlation values between intensity-related signals corresponding to the detected intensity of the sample light having been transformed by the logarithmic operation and predetermined feature signals; and a concentration calculation unit that calculates a concentration of the target component using the sample correlation values obtained by the correlation value calculation unit , wherein the feature signals are signals that are used to extract a waveform feature of the intensity-related signals, and are sinusoidal wave signals or other signals matched to waveform features that have been extracted from the intensity-related signals, and DC components have been removed from at least one of the feature signals or the intensity related signals, the correlation value calculation unit calculates a plurality of sample correlation values using a number of feature signals that is equal to or greater than a number obtained by combining the number of types of target components with the number of types of interference components, and the concentration calculation unit , using the plurality of sample correlation values obtained by the correlation value calculation unit , calculates the concentration of the target component from which interference effects have been removed. a light source that emits modulated light whose wavelength is modulated using a predetermined modulation frequency; a photodetector that detects an intensity of sample light obtained when the modulated light is transmitted through the sample; a logarithmic operation unit that performs a logarithmic operation on light intensity signals obtained by the photodetector , a correlation value calculation unit that calculates sample correlation values which are correlation values between intensity-related signals corresponding to the detected intensity of the sample light having been transformed by the logarithmic operation and predetermined feature signals; and a concentration calculation unit that calculates a concentration of the target component using the sample correlation values obtained by the correlation value calculation unit , wherein the feature signals are signals that are used to extract a waveform feature of the intensity-related signals, and are sinusoidal wave signals or other signals matched to waveform features that have been extracted from the intensity-related signals, and DC components have been removed from at least one of the feature signals or the intensity related signals, the correlation value calculation unit calculates a plurality of sample correlation values using a number of feature signals that is equal to or greater than a number obtained by combining the number of types of target components with the number of types of interference components, and the concentration calculation unit , using the plurality of sample correlation values obtained by the correlation value calculation unit , calculates the concentration of the target component from which interference effects have been removed. <EOS>