PROBLEM TO BE SOLVED: To provide a heating tool capable of effectively applying heating by flexibly bending along the spine and adhering to the surface of the body even when the heating tool hits the spine. A heating tool (1) includes a heat generating material (2) and a main body (3) that accommodates the heat generating material (2). The main body (3) has a first area (35A) located at the center in the left-right direction and a first area (3A). The filling rate of the heat generating material 2 contained in the first region 35A is at least including the second region 35B and the third region 35C arranged via the regulation line 33 that regulates the movement of the heat generating material 2 on the left and right, and The filling rate of the heat generating material 2 accommodated in the second region 35B and the third region 35C is large. [Selection diagram] Figure 1【課題】温熱具が脊椎などに当たっても、脊椎に沿って柔軟に折れ曲がって身体の表面に密着することで、温熱を効果的に与えることができる温熱具を提供する。【解決手段】温熱具１は、発熱材料２と、発熱材料２を収容する本体部３とを備え、本体部３は、左右方向の中心に位置する第１領域３５Ａと、第１領域３Ａの左右に発熱材料２の移動を規制する規制ライン３３を介して配置された第２領域３５Ｂ及び第３領域３５Ｃとを少なくとも含み、第１領域３５Ａに収容される発熱材料２の充填率よりも、第２領域３５Ｂ及び第３領域３５Ｃに収容される発熱材料２の充填率方が大きい。【選択図】図１
