PURPOSE: To absorb the electromagnetic wave by loading a wave absorption plate consisting of a flat thin paper and a corrugated thin paper having an electric resistance into a hollow cubic frame and converting the outside electromagnetic wave into the heat energy.

CONSTITUTION: A wave absorption plate consisting of a flat thin paper 2 and a corrugated thin paper 3 having an electric resistance is loaded into a hollow cubic frame 1 with the electric resistance. When an electromagnetic wave 4 comes incident, a wave guide consisting of the periphery of cubic frame 1 and a small cavity waveguide 6 consisting of the thin paper 2 and 3 form a double construction. Then, the electromagnetic wave 4 is rapidly heat energized exponentially. According to the constitution, the electromagnetic wave is absorbed.