A heating instrument (100) is equipped with: a sheet (10) having a projection (12) which curves so as to be convex on one surface side thereof, and have a cavity (13) formed on the other surface side thereof； and a heat-generating material (30) which is packed into the cavity (13) of the projection (12).溫熱器具(100)具備：片材(10)，其具有突起部(12)，該突起部(12)向一面側凸狀彎曲且另一面側成為空腔(13)；及發熱材(30)，其被填充於突起部(12)之空腔(13)。
