HEATING BAG

To provide a heating bag in which a fastener mechanism which can be opened freely, is not easily opened due to pressure in a bag in heating time.SOLUTION: A fastening part 102 comprises a pair of engagement members formed of a male engagement member 202 and a female engagement member 201 which can seal an outer edge of a bag so that the bag can be easily opened, and the male engagement member 202 and the female engagement member 201 are brought into contact each other in a planar state for sealing. A surface opposite to the engagement surface is a surface to be stuck to inside of the bag, the surface is stuck to inside of an upper opening of a heating bag 101 along the opening. The fastener part 102 has a belt-state coating part 203 along the opening, similar to the engagement member on a lower part of one of the male engagement member 202 and the female engagement member 201.SELECTED DRAWING: Figure 2 【課題】 自在に開閉できる留め具機構が加熱時の袋内部の圧力により容易に開かないこと。【解決手段】 留め部１０２は、袋の外縁を開封自在に密閉することが可能な雄係合部材２０２及び雌係合部材２０１からなる一対の係合部材を備え、雄係合部材２０２と雌係合部材２０１とが面状に接触し合って密閉される。係合する面と反対の面は袋の内側に貼り付けられる面となっており、その面が加熱用袋１０１の上部開口部の内側に開口部に沿って貼り付けられている。留め部１０２は、雄係合部材２０２及び雌係合部材２０１の一方の下部に、係合部材と同様に開口部に沿って帯状の被覆部２０３を備える。【選択図】 図２