PROBLEM TO BE SOLVED: To provide a heating element capable of obtaining high bonding strength while preventing a heating material from leaking without impairing the feeling of mutual bonding part of sheet materials.SOLUTION: The heating element 1 is provided with a housing body 3 for which at least a partially air permeable sheet material is bonded at the peripheral edge part formed into a flat bag shape, and a heating part 2 disposed inside the housing body 3. The housing body 3 is provided with an adhesion area 41 where the sheet materials are attached with an adhesive, and a fusion area 42 positioned inwards in the plane direction of the adhesion area 41, where the sheet materials are heat-fused, and the heating part 2 is sealed with the fusion area 42. It is preferable that the adhesion area 43 is formed further on the inner side of the fusion area 42.COPYRIGHT: (C)2009,JPO&INPIT【課題】シート材どうしの接合部の風合いを損なうことなく、発熱材料の漏れ出しが防止された高い接合強度を達成し得る発熱体を提供すること。【解決手段】発熱体1は、少なくとも一部分に通気性を有するシート材が、その周縁部において接合されて扁平な袋状に形成された収容体3と、収容体3内に配された発熱部2とを備える。収容体3は、該シート材が粘着剤で接着した接着領域41と、接着領域41の平面方向内方に位置し且つ該シート材が熱融着した融着領域42とを有し、融着領域42により発熱部2が密封されている。融着領域42の内側に更に接着領域43が形成されていることが好ましい。【選択図】図3
