This heating tool (100) is designed to be disposed on an inner side of a mask that covers the nose and mouth of a user and includes a pair of steam generators (50) which are arranged side by side in the longitudinal direction of the heating tool (100). The pair of steam generators (50) are contained in an outer body (60) and each include a bag body (53) having a first sheet (51) that is located on the user side and a second sheet (52) that is located opposite the user side, the first sheet (51) having an air permeability of 10,000 sec/100 ml or less, the second sheet (52) having an air permeability higher than that of the first sheet (51), and the outer body (60) having a slit (70).本發明之溫熱器具(100)係配置於覆蓋使用者之鼻與嘴之口罩之內側的溫熱器具(100)，且具備於溫熱器具(100)之長邊方向排列配置之一對水蒸氣產生體(50)，一對水蒸氣產生體(50)收容於外裝體(60)，水蒸氣產生體(50)具備袋體(53)，該袋體(53)包括位於上述使用者側之第1片材(51)、及位於與上述使用者側為相反側之第2片材(52)，第1片材(51)之透氣度為10,000秒/100 ml以下，第2片材(52)之透氣度高於第1片材(51)之透氣度，外裝體(60)具有狹縫(70)。
