PROBLEM TO BE SOLVED: To provide a volatilizer capable of suppressing exhaustion of a volatile agent by pressure rise in a container in accompany with heating from outside or the like.SOLUTION: A volatilizer 1A comprises: a volatile member 4 having a volatilization part 4a a connection member 5 connecting with the volatile member 4 to be capable of advancing/retracting a container 3 accommodating a volatile agent and connecting with the connection member 5 a storage chamber 6 of the connection member 5 formed between a first aperture 5a and a second aperture 5b a first opening and closing part 7 opening the first aperture 5a by advancing the connection member 5 to communicate inside of the container 3 with inside of the storage chamber 6 and closing the first aperture 5a by retracting the connection member 5 and a second opening and closing part 8 closing the second aperture 5b by advancing the connection member 5 and opening the second aperture 5b by retracting the connection member 5 to communicate inside of the storage chamber 6 with the volatilization part 4a.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2019,JPO&INPIT【課題】外部からの加熱などに伴う容器の内部の圧力上昇による揮散剤の消耗を抑制できる揮散器を提供する。【解決手段】揮散器1Aは、揮散部4aを有する揮散部材4と、前進及び後退できるように揮散部材4に連結された連結部材5と、揮散剤を内部に収容するとともに連結部材5に連結された容器3と、連結部材5に設けられ、第1の開口5aと第2の開口5bとの間に形成された貯留室6と、連結部材5の前進によって、第1の開口5aを開放させて容器3の内部を貯留室6の内部に通じさせる一方、連結部材5の後退によって、第1の開口5aを閉塞させるように構成された第1の開閉部7と、連結部材5の前進によって、第2の開口5bを閉塞させる一方、連結部材5の後退によって、第2の開口5bを開放させて貯留室6の内部を揮散部4aに通じさせるように構成された第2の開閉部8とを備える。【選択図】図1