A heating appliance is provided with a sheet-shaped main body sheet having a heating element, and a projection sheet provided to one surface of the main body sheet, the projection sheet having a convex projection on the one side thereof, and when the magnitude of a load when the projection is pressed in the direction opposite to the protrusion direction of the projection is designated as a first axis, and the amount of crushing of the projection is designated as a second axis, a profile of the relationship between the load and the amount of crushing includes a first region (R1) in which the amount of crushing increases as the load increases, and a second region (R2) which is positioned on a side on which the value in the first axis is larger than in the first region (R1) and in which the ratio of increase in the amount of crushing in conjunction with the increase in the load is larger than the ratio of increase in the first region (R1), the range of the second region (R2) being wider than the range of the first region (R1) in the direction of the first axis.本發明之溫熱器具具備：片狀之本體片材，其具有發熱體；及突起部片材，其設置於本體片材之一面；且突起部片材具有向上述一側凸起之突起部，若將對突起部朝相對於該突起部之突出方向相反之方向進行按壓時之荷重大小設為第1軸，將該突起部之壓扁量設為第2軸，則上述荷重與上述壓扁量之關係之分佈包含：第1區域(R1)，其係伴隨荷重之增大而壓扁量增大；及第2區域(R2)，其係位於第1軸上之值大於第1區域(R1)之側，且伴隨荷重之增大之壓扁量之增大比率大於第1區域(R1)中之增大比率；且於第1軸之方向上，第2區域(R2)之範圍較第1區域(R1)之範圍更廣。
