[PROBLEMS] To provide a chemical transpiration apparatus by which the formation of droplets of a transpired chemical is inhibited and thus the transpiration efficacy can be elevated. [MEANS FOR SOLVING PROBLEMS] A chemical transpiration apparatus (1) for transpiring a chemical by heating a support (14) impregnated with the chemical, which comprises the apparatus body (10) having a heater (12), a protective cover (20) attached to the apparatus body (10) and a holder (22) holding the support (14) between the heater (12) and the protective cover (20), wherein the holder (22) holds the support (14) in a standing state during using and forms a space (S) between the support (14) and the protective cover (20) in such a manner that the space (S) is connected to the outside at least in the upper part.
