To immediately cope with the case that gasoline or the like on a floor surface ignites by burying a fire extinguishing nozzle underground and incorporating an extension pipe projectable onto the ground at the time of forcibly feeding a fire extinguishing chemical.

When the gasoline leaked from a fueling nozzle drops in a fueling stop area SA1 and ignites, a monitoring person selects a section SA1 where a fire occurs among fire extinguishing sections. An operation panel 71 outputs signals to a fire extinguishing chemical unit 60 and the solenoid S of a nitrogen pressure container 67 is opened. Then, a foam solution inside a foam solution tank 65 is extruded, the foam solution operates a pressure switch 68 and activation signals are outputted to the operation panel 71. Simultaneously, the operation panel 71 outputs the opening signals of a motor-driven ball 50d pertinent to the section of the fire in a valve unit 50. Then, foam fire extinguishing fluid is supplied to the fire extinguishing nozzle SH1, the foam fire extinguishing fluid flows into a nozzle main body and the extension pipe and foams are discharged to a fire extinguishing area SA by the pressure.