Provided is a concentration
measurement device that measures the concentration of a sample by absorptiometry, the concentration
measurement device being capable of performing
temperature measurement in a shorter amount of time than conventional concentration measurement devices. A concentration
measurement device 1 comprises a
sample temperature sensor 13 that measures the temperature of samples, optical sensors 141, 142 that measure the
transmittance of samples, an
environmental temperature sensor 13 that measures the
environmental temperature, a storage unit 12 that stores second correlation information between first difference information for the value of the
environmental temperature and the value of the temperature of a calibration sample measured by the concentration measurement device 1 and second difference information for the measured value of the temperature of the calibration sample and a theoretical temperature based on first correlation information between the temperature and the
transmittance of the calibration sample with respect to the value of the
transmittance of the calibration sample measured by the concentration measurement device 1, and a temperature calibration unit 11 that acquires difference information for the measured value of the temperature of a sample to be measured and the measured value of the environmental temperature and calibrates the
temperature measurement value for the sample to be measured using calibration temperature information based on the second correlation information with respect to the acquired difference information.