| abstract |
[PROBLEMS] To provide a heating tool which is excellent in manufacturability and has good heat generation characteristics. A heating tool is formed by laminating a heat generating layer 121A and a base material layer 121C containing an oxidizable metal, a carbon component, a water-soluble polymer, and water. The carbon component has a water absorption rate of 160% or more and 400% or less of its own weight, and an average particle diameter of 10 μm to 400 μm, and the water content in the base material layer, The mass ratio (water / metal) to the content of the oxidizable metal in the heating tool is 0.05 to 0.38. [Selection] Figure 1 |