Provided is a superior heating tool able to exhibit a desired aromaticity during use even after having been stored for a long time. A heating tool, in which is held a holder pouch containing a fragrance as well as an exothermic composition containing water, an oxidizable metal powder, and a pro-oxidant having the ability to adsorb at most 500 mg/g of iodine, at least the exothermic composition being breathable.本發明係提供一種即便長期間保存之後，在使用時亦能夠發揮所需要的芳香性之更優異的發熱件。即，一種發熱件，其含有發熱性組成物及香料，其中該發熱性組成物係含有碘吸附性能500mg/g以下的氧化促進劑、可氧化性金屬粉及水；並且，至少前述發熱性組成物被收容在具有通氣性的收容袋中。
