A heating appliance (50) is provided with a heating element (100) including a heat generating part (10) containing an oxidizable metal, a carbon component, and water, and an accommodating body (20) for accommodating the heat generating part (10), the accommodating body (20) being air-permeable on at least one side thereof, and the heating appliance (50) satisfies the conditions below. Conditions: In a temperature measurement at a room temperature of 20 DEG C and a humidity of 50%, after the start of heat generation by the heating element (100), the average rate of change of the surface temperature (DEG C) of the heating appliance (50) at a position on the other side of the accommodating body (20) and facing a heat generating region from the time that the surface temperature (DEG C) of the heating appliance (50) reaches the maximum value thereof until the surface temperature reaches 45 DEG C is -1.0 DEG C/minute to -0.5 DEG C/minute.本發明之溫熱器具(50)具備發熱體(100)，該發熱體(100)包含：發熱部(10)，其含有被氧化性金屬、碳成分及水；以及收容體(20)，其收容發熱部(10)，且於至少一面具有透氣性；並且溫熱器具(50)滿足以下條件。條件：當於室溫20℃濕度50%之環境下測定溫度時，發熱體(100)開始發熱後，於收容體(20)之另一面側、且位於面對發熱區域之位置之溫熱器具(50)之表面溫度(℃)達到最高溫度後，溫熱器具(50)之表面溫度(℃)達到45℃前之該表面溫度之平均變化率為-1.0℃/分鐘以上且-0.5℃/分鐘以下。
