To provide a data processing device for FTIR capable of easily specifying a functional group included in a component contained in a specimen.SOLUTION: A data processing device 20 for FTIR includes: a measurement spectrum data acquisition part 22 for acquiring data of measurement spectrum which is an absorbance spectrum or a transmittance spectrum of a specimen to be measured; and a functional group data storage part 211 in which data on a peak of an absorbance spectrum or a transmission spectrum derived from a known functional group is stored in association with information indicating the functional group; and a functional group specification part 24 for specifying the functional group included in a component contained in the specimen to be measured by comparing data of the measurement spectrum with data on the peak stored in the functional group data storage part 211.SELECTED DRAWING: Figure 1
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