A chromatograph device configured to separate and measure a plurality of components contained in a sample in terms of time, the chromatograph device comprising: a) a storage section configured to store measurement parameters respectively associated with a plurality of target components assumed to be contained in a measurement target sample, measurement conditions including switching times as timings for switching the measurement parameters for each of two target components eluted in succession from a column, and formulas for determining the switching times using retention times for predetermined one or a plurality of target components among the plurality of target components; b) a measurement data accumulation section configured to accumulate data acquired by measurement using the chromatograph device along with information relating to a column type, a mobile phase type, and a mobile phase flow velocity in the measurement; c) a preceding-measurement-data determination section configured to determine, at the time of measurement target sample measurement, whether there is preceding measurement data in the measurement data accumulation section, the preceding measurement data being data obtained from measurement of the one or plurality of target components in measurement sharing the same column type, mobile phase type, and mobile phase flow velocity as the measurement; and d) a measurement execution section configured to carry out measurement of the measurement target sample on the basis of the measurement conditions if there is no preceding measurement data and, if there is preceding measurement data, determine the retention times of the one or plurality of target components on the basis of the most recent preceding measurement data, determine updated switching times as new switching times on the basis of the retention times and the formulas, and carry out measurement of the measurement target sample with the switching times included in the measurement conditions changed to the updated switching times. a) a storage section configured to store measurement parameters respectively associated with a plurality of target components assumed to be contained in a measurement target sample, measurement conditions including switching times as timings for switching the measurement parameters for each of two target components eluted in succession from a column, and formulas for determining the switching times using retention times for predetermined one or a plurality of target components among the plurality of target components; b) a measurement data accumulation section configured to accumulate data acquired by measurement using the chromatograph device along with information relating to a column type, a mobile phase type, and a mobile phase flow velocity in the measurement; c) a preceding-measurement-data determination section configured to determine, at the time of measurement target sample measurement, whether there is preceding measurement data in the measurement data accumulation section, the preceding measurement data being data obtained from measurement of the one or plurality of target components in measurement sharing the same column type, mobile phase type, and mobile phase flow velocity as the measurement; and d) a measurement execution section configured to carry out measurement of the measurement target sample on the basis of the measurement conditions if there is no preceding measurement data and, if there is preceding measurement data, determine the retention times of the one or plurality of target components on the basis of the most recent preceding measurement data, determine updated switching times as new switching times on the basis of the retention times and the formulas, and carry out measurement of the measurement target sample with the switching times included in the measurement conditions changed to the updated switching times.