To find a fire in an early stage, immediately extinguish the fire and minimize water loss by tire extinguisher by providing plural smoke sensing means and discharging the fire extinguisher in the case of receiving smoke detection signals from the plural smoke sensing means.

Plural smoke sensors 30 provided near the ceiling of a fire extinction object area are provided and connected through a signal line to a controller 31. Also, a first solenoid valve 17 for activation, second solenoid valves 24a, 24b and 24c for activation, a pressure air tank 10 for activation and a pump device 3 for fire extinction are also connected through the signal line to the controller 31 and the controller 31 is connected through the signal line to a fire alarming device 32. In this case, the controller 31 originates discharge signals and discharges the fire extinguisher in the case of receiving the smoke detection signals from the at least two smoke sensors 30.