PROBLEM TO BE SOLVED: To provide a heat producing bag efficiently heating liquid to a predetermined temperature by meandering a part of a tube in which liquid such as infusion circulates and heating the meandering portion from the side face in a flat-shaped heat producing bag formed by storing a heat producing composition producing heat by a contact with oxygen in air, in an air permeable bag.SOLUTION: (1) This heat producing bag is provided with a piercing section, a notched section, a projecting section or a cylindrical member to the circumferential section of the flat-shaped heat producing bag. (2) This heat producing bag is provided with fitting sections, when being folded in two, fitted to each other at least at one positions of the circumference part of the bag coming into contact with each other, or (3) this heat producing bag has a sheet-like heat insulating material, and fitting parts fitted to each other, when the heat insulating material is superposed on the bag, at least at one positions of the circumferential parts of the bag and the heat insulating material coming into contact with each other.COPYRIGHT: (C)2009,JPO&INPIT【課題】 空気中の酸素と接触して発熱する発熱組成物が、通気性の袋に収納されてなる偏平状の発熱袋であって、輸液等の液体が流通するチューブの一部を蛇行させて、該蛇行部分を側面から加温し、液体を所定の温度に効率よく加温する発熱袋を提供する。【解決手段】 (1)偏平状の発熱袋の周辺部に、貫通部、切欠部、凸部、または筒状部材が設けられてなる発熱袋、(2)袋を二つ折りにした際、互いに接触する該袋の周辺部の少なくとも一部の位置に、互いに嵌合する嵌合部が設けられてなる発熱袋、または(3)シート状の断熱材を備え、袋と該断熱材を重ね合せた際、互いに接触する該袋と該断熱材の周辺部の少なくとも一部の位置に、互いに嵌合する嵌合部が設けられてなる発熱袋とする。【選択図】 図6
