An electrostatic spray device (1) comprising a tank section (11) filled with liquid, a gas supply path (6a) for communicating with the tank section (11), a pump (2) for pressurizing the liquid within the tank section (11) by supplying air to the tank section (11) through the gas supply path (6a), and a control unit (4) for controlling the supply operation of the pump (2) so as to adjust the pressure within the tank section (11).
