A discharge device for sucking a discharge liquid in an amount corresponding to plural discharges through a discharge port of a nozzle unit having a flow passage, which is filled with a pressure transmission medium, with a gap interposed between the pressure transmission medium and the discharge liquid, and for continuously fly-discharging very small amounts of liquid droplets, the discharge device comprising: a nozzle unit, said nozzle unit having a flow passage that is communicated with the discharge port; a storage unit including a liquid regulator and configured for supplying the pressure transmission medium in liquid phase under regulated pressure to the nozzle unit side; a pressurization unit with means for supplying a pressurized gas under regulated pressure to the storage unit side; a pump mechanism communicated with the storage unit and the nozzle unit in a fluid communicating way; a branch unit provided with a branched flow passage for communicating the nozzle unit, the storage unit, and the pump mechanism with each other; a discharge valve with means for establishing or blocking communication between the branch unit and the nozzle unit; a supply valve with means for establishing or blocking communication between the branch unit and the storage unit; and a control unit, wherein the control unit is configured to perform control such that, in a state where the discharge valve is closed and the supply valve is opened, the pressurized gas under pressure regulated by the pressurization unit is supplied to the storage unit side and the pressure transmission medium in liquid phase under a certain pressure regulated by the storage unit is supplied to the supply valve side, and that the discharge valve is then opened and closed at predetermined timings, thereby continuously fly-discharging the very small amounts of liquid droplets. a nozzle unit, said nozzle unit having a flow passage that is communicated with the discharge port; a storage unit including a liquid regulator and configured for supplying the pressure transmission medium in liquid phase under regulated pressure to the nozzle unit side; a pressurization unit with means for supplying a pressurized gas under regulated pressure to the storage unit side; a pump mechanism communicated with the storage unit and the nozzle unit in a fluid communicating way; a branch unit provided with a branched flow passage for communicating the nozzle unit, the storage unit, and the pump mechanism with each other; a discharge valve with means for establishing or blocking communication between the branch unit and the nozzle unit; a supply valve with means for establishing or blocking communication between the branch unit and the storage unit; and a control unit, wherein the control unit is configured to perform control such that, in a state where the discharge valve is closed and the supply valve is opened, the pressurized gas under pressure regulated by the pressurization unit is supplied to the storage unit side and the pressure transmission medium in liquid phase under a certain pressure regulated by the storage unit is supplied to the supply valve side, and that the discharge valve is then opened and closed at predetermined timings, thereby continuously fly-discharging the very small amounts of liquid droplets.