To enable a user to rapidly start initial fire extinguishing work right after ignition by a familiar method without confusion and bewilderment and to enable the user to start the fire extinguishing work as rapidly as possible.

The inner side periphery of the upper section of a main body 1 which is a fire extinguishing bag is mounted with the bag 2 hermetically sealed therein with the fire extinguishing agent such that the bag is burned and broken by a flame and the fire extinguishing agent is sprayed. Magnets 5 are attached to the inner periphery of the front end of a sectorial sheet 4 attached to the bag by fixtures to shut the air. Further, shape memory hardware 3 is utilized to make the bag smaller so as to facilitate housing and to expedite restoration in implementation and use and to constitute a handle as well.