A calibration apparatus comprising: a chemical sensor being configured to measure a calibration liquid; a conversion calculation unit being configured to acquire a measurement value of the calibration solution that is measured by the chemical sensor, the conversion calculation unit being configured to calculate and to output a conversion calculation output; a calibration sensitivity extraction unit being configured to receive the conversion calculation output from the conversion calculation unit, the calibration sensitivity extraction unit being configured to extract a calibration sensitivity from the conversion calculation output; a calibration history storage unit being configured to receive the calibration sensitivity from the calibration sensitivity extraction unit, the calibration history storage unit being configured to store past histories of the calibration sensitivity; and a sensitivity variation curve prediction unit being configured to read the past histories of the calibration sensitivity, the sensitivity variation curve prediction unit being configured to predict a sensitivity variation curve based on the past histories of the calibration sensitivity, characterized in that the sensitivity variation curve prediction unit is configured to continuously calculate a sensitivity correction value (a"(t)) based on the sensitivity variation curve, and to supply the sensitivity correction value to a sensitivity correction part for performing a sensitivity correction in a measurement apparatus; and further comprising a sensitivity variation curve shift unit being configured to cause the predicted sensitivity variation curve to be matched to a newest value of the calibration sensitivity. a chemical sensor being configured to measure a calibration liquid; a conversion calculation unit being configured to acquire a measurement value of the calibration solution that is measured by the chemical sensor, the conversion calculation unit being configured to calculate and to output a conversion calculation output; a calibration sensitivity extraction unit being configured to receive the conversion calculation output from the conversion calculation unit, the calibration sensitivity extraction unit being configured to extract a calibration sensitivity from the conversion calculation output; a calibration history storage unit being configured to receive the calibration sensitivity from the calibration sensitivity extraction unit, the calibration history storage unit being configured to store past histories of the calibration sensitivity; and a sensitivity variation curve prediction unit being configured to read the past histories of the calibration sensitivity, the sensitivity variation curve prediction unit being configured to predict a sensitivity variation curve based on the past histories of the calibration sensitivity, characterized in that the sensitivity variation curve prediction unit is configured to continuously calculate a sensitivity correction value (a"(t)) based on the sensitivity variation curve, and to supply the sensitivity correction value to a sensitivity correction part for performing a sensitivity correction in a measurement apparatus; and further comprising a sensitivity variation curve shift unit being configured to cause the predicted sensitivity variation curve to be matched to a newest value of the calibration sensitivity.