To provide a fluid ejection device capable of ejecting cleaning liquid atomized into minute droplets of relatively uniform particle diameters by the strong force of liquid and gas being spread and ejected therefrom even if negative pressure generated by the force of pressurized gas being ejected is utilized for the ejection.

The fluid ejection device is comprised of a gas ejection pipe 7 fabricated from a flexible tube communicating with a supply source 2 of pressurized gas via a pipeline with the base end of the ejection pipe 7 fixed to the rear end of an outer pipe 6 and the tip end of the ejection pipe 7 constituting a free end, which ejection pipe 7 is gyrated along the inner face of the outwardly expanding trumpet-shaped outer pipe 6 by the pressurized gas being ejected therefrom, and a liquid ejection nozzle member 10 communicating with a liquid supply source 3 via a pipeline 11 and attached to the wall face of the outer pipe 6 in the vicinity of its rear end, which nozzle member 10 ejects liquid from the tip in the direction of the open end of the outer pipe 6 by virtue of the negative pressure generated behind the space wherein the gas ejection pipe 7 is gyrated or by virtue of the pressure of water such as city water and the negative pressure as well.