PURPOSE: To provide a structural material with a fire extinguishing function which has a relatively light weight, high strength and heat insulation and can early extinguish a fire without requiring hands.

CONSTITUTION: A plate material 1 made of a combustible material such as plastic, etc., has rectangular wall plates 2, 3 provided at a predetermined interval, and frame plates 4, 5 provided at outer peripheral ends of the plates 2, 3. Powderlike fire extinguishing agent 8 is filled in a hollow part 1 formed of the plates 2, 3 and 4, 5. At the time of occurring a fire, when a flame approaches the plates 2, 3, temperatures of the wall surfaces become high temperature to be melted to generate burned holes. In this case, the agent 8 of the part S1 is externally scattered from the holes to extinguish the fire.