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 within a predetermined range including a resonance frequency 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 within a predetermined range including a resonance frequency 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 within a predetermined range including a resonance frequency 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.