PROBLEM TO BE SOLVED: To provide a heat-transpirating device achieving the facility of assembly and the reliability and safety of an electric circuit, while having a light source for illuminating a liquid container and a heater for evaporating a chemical.SOLUTION: The heat-transpirating device 1 includes: an enclosure section 3 which covers a liquid absorbing core 105 freely drawably and insertably the heater 5 which is housed in the enclosure section 3 and freely heats liquid absorbing core 105 the light source 6 which freely emits light to illuminate the liquid container 101 a power plug 7 that leads power supplied to the heater 5 and the light source 6 a resistance 8 installed between the power plug 7 and the light source 6 a first pressing section 9 electrically connecting the resistance 8 and the light source 6 and a light source mounting plate 11 which is housed in the enclosure section 3 and around which the light source 6, the first pressing section 9, and the resistance 8 are wound.