1. An oscillation device that uses a piezoelectric resonator to obtain an oscillation output based on a frequency setting value, the oscillation device comprising:a storage unit, storing a prediction data generated based on an acquired result of a correspondence relationship between an elapsed time and an oscillation frequency during a time period from after a start of oscillation of the piezoelectric resonator up to a preliminary set elapsed time, the prediction data corresponding to a correspondence relationship between the oscillation frequency and an accumulated elapsed time of the oscillation after the start of the oscillation, and the accumulated elapsed time including a dine after the preliminary set elapsed time;
a time measurement unit, configured to measure the accumulated elapsed time of the oscillation after the start of the oscillation of the piezoelectric resonator;
a correction value operator, configured to obtain a correction value of the frequency setting value based on the accumulated elapsed time of the oscillation measured in the time measurement unit and the prediction data stored in the storage unit; and
an addition unit, configured to obtain a corrected frequency setting value by adding the correction value obtained in the correction value operator to the frequency setting value.