A discharge device comprising: a load including a discharge electrode configured to hold liquid , and a counter electrode that is disposed to face the discharge electrode via a gap; a liquid supply unit configured to cool down the discharge electrode to generate dew condensation water serving as the liquid on a surface of the discharge electrode ; and a voltage application device including: a voltage application circuit configured to apply a voltage between the discharge electrode and the counter electrode , and to generate discharge between the discharge electrode and the counter electrode ; and a control circuit configured to control the voltage application circuit ; wherein the voltage application circuit is adapted to periodically change, during a drive period, a magnitude of the voltage applied to the load at a drive frequency (f1) within a predetermined range including a resonance frequency (fr1) of the dew condensation water , as to mechanically vibrate the dew condensation water ; characterized in that the discharge device further comprises a sensor configured to measure at least one of a temperature and a humidity, and generation amount adjuster configured to adjust a generation amount of the dew condensation water in the liquid supply unit based on an output of the sensor . a load including a discharge electrode configured to hold liquid , and a counter electrode that is disposed to face the discharge electrode via a gap; a liquid supply unit configured to cool down the discharge electrode to generate dew condensation water serving as the liquid on a surface of the discharge electrode ; and a voltage application device including: a voltage application circuit configured to apply a voltage between the discharge electrode and the counter electrode , and to generate discharge between the discharge electrode and the counter electrode ; and a control circuit configured to control the voltage application circuit ; wherein the voltage application circuit is adapted to periodically change, during a drive period, a magnitude of the voltage applied to the load at a drive frequency (f1) within a predetermined range including a resonance frequency (fr1) of the dew condensation water , as to mechanically vibrate the dew condensation water ; characterized in that the discharge device further comprises a sensor configured to measure at least one of a temperature and a humidity, and generation amount adjuster configured to adjust a generation amount of the dew condensation water in the liquid supply unit based on an output of the sensor . a voltage application circuit configured to apply a voltage between the discharge electrode and the counter electrode , and to generate discharge between the discharge electrode and the counter electrode ; and a control circuit configured to control the voltage application circuit ; wherein the voltage application circuit is adapted to periodically change, during a drive period, a magnitude of the voltage applied to the load at a drive frequency (f1) within a predetermined range including a resonance frequency (fr1) of the dew condensation water , as to mechanically vibrate the dew condensation water ; characterized in that the discharge device further comprises a sensor configured to measure at least one of a temperature and a humidity, and generation amount adjuster configured to adjust a generation amount of the dew condensation water in the liquid supply unit based on an output of the sensor . <EOS>