Since the entire structure of the sheet shaped heat generating body is integrated, with the fibrous and porous sheet shaped substrate assuring uniform distribution and firm support of the oxidizable metal powder or the heat generating substance, the body is flexible, is free from {HEAD ~ one sided distribution} of {TAIL ~ the heat generating substance}, and has excellent heat generating capability 
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Since the entire structure of the sheet shaped heat generating body is integrated , with the fibrous and porous sheet shaped substrate assuring uniform distribution and firm support of the oxidizable metal powder or the heat generating substance , the body is flexible , is free from { HEAD ~ one sided distribution } of { TAIL ~ the heat generating substance } , and has excellent heat generating capability
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