To provide a simply structured inexpensive fire extinguisher by constituting a container body of a cylindrical body with elastic contraction force.

The subject fire extinguisher is composed of the container body for filling a fire extinguishing material and an operation head for radiating the fire extinguishing material inside the container body to the outside, and the container body is constituted of the cylindrical body with the elastic contraction force. Thus, a structure becomes simple, costs are low, and the need of a pressure gas cylinder and a siphon pipe for radiating the fire extinguishing material is eliminated. Also, certainty of an operation at the time of emergency is kept, it is safe and the fire extinguishing material is surely radiated when emergent time.