PROBLEM TO BE SOLVED: To provide a disinfectant diffusion device and a disinfectant diffusion method, which are excellent in designability and can stably disperse a disinfectant. A disinfectant diffusion device (10) contains a disinfectant containing chlorine dioxide, a disinfectant, a first container (130) having a first opening, and a second container (130). The second container 100 of the ceramics provided with. The first container 130 includes a first portion defining a first opening, a second portion located below the first portion and having a diameter larger than the first opening, and a portion located below the second portion. The second container 100 has a third part having a diameter larger than that of the second part, the second container 100 accommodates the first container 130, a main body part 120 provided with a second opening, and a lid part 110 fitted into the second opening. And a lid portion 110 is provided with a hole 111 for diffusing chlorine dioxide. [Selection diagram] FIG.【課題】意匠性に優れ、かつ、安定して殺菌剤を拡散させることが可能な殺菌剤の拡散装置および殺菌剤の拡散方法を提供する。【解決手段】殺菌剤の拡散装置１０は、二酸化塩素を含む殺菌剤と、殺菌剤を収納し、第一開口が設けられた第一容器１３０と、第一容器１３０を収納する、第二開口が設けられた陶磁器の第二容器１００とを備える。第一容器１３０は、第一開口を規定する第一部分と、第一部分よりも下側に位置して第一開口よりも大径の第二部分と、第二部分よりも下側に位置して第二部分よりも大径の第三部分とを有し、第二容器１００は第一容器１３０を収納し、第二開口が設けられる本体部分１２０と、第二開口に嵌まり合う蓋部分１１０とを有し、蓋部分１１０には二酸化塩素を拡散させるための孔１１１が設けられている。【選択図】図３
