PROBLEM TO BE SOLVED: To reduce the size of a vessel for storing a decomposition catalyst.SOLUTION: There is provided a sterilization system for sterilizing an object to be sterilized which is stored in a decompression storage by decompressing the inside of the decompression storage, wherein the sterilization system comprises the decompression storage, supply means for supplying a sterilizer gas into the decompression storage and a vessel provided in the decompression storage in which a decomposition catalyst for decomposing decomposition components in the sterilizer gas and decompression means for decompressing the vessel, the vessel is provided with a valve which can be opened by decompressing the inside of the vessel with the decompression means to conduct the inside of the decompression storage and the inside the vessel and is opened so as not to conduct the inside of the decompression storage and the inside the vessel without decompressing the inside of the vessel with the decompression means.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】 分解触媒を収容する容器を小型化すること。【解決手段】 減圧庫内を減圧して、減圧庫内に収容される被滅菌物を滅菌する滅菌システムであって、前記減圧庫と、滅菌剤ガスを前記減圧庫内に供給する供給手段と、前記減圧庫内に設けられた、前記滅菌剤ガスの滅菌成分を分解する分解触媒が設けられた容器と、前記容器を減圧する減圧手段と、を備え、前記容器は、前記減圧手段が前記容器内を減圧することで開弁して前記減圧庫内と前記容器内とを導通できるようにし、前記減圧手段が前記容器内を減圧しないことで閉弁して前記減圧庫内と前記容器内とを導通出来ないようにする弁を備えることを特徴とする。【選択図】 図1