The present invention provides a scheduling device which can carry out scheduling of process execution periods of time, included in plural pieces of processing target data, respectively. The scheduling device sorts out plural pieces of substance data by looking up a retention time, included in each of the plural pieces of substance data. The scheduling device groups the plural pieces of substance data into a plurality of functions Fn so that pieces of substance data, included in each of the plurality of functions Fn, is successively arrayed in an order resulting from the sorting. Further, the scheduling device finds, for each of the plurality of functions Fn, a function range between a detection start time included in that function Fn and a detection end time included in that function Fn, and groups the plurality of functions Fn into a measurement group(s) In so that an interval between functions Fn included in the same measurement group is more than a condition set in advance.