Providing sterilization device and sterilization method capable of reliably sterilizing the United States Patent endoscope bacteria deposited outside and inside of. The apparatus includes a sterile object A first sterilization unit 2 capable of containing a second sterile part 4 capable of a receiving bag B that houses the sterilizing object A, the first sterilization unit 2, and a second sterilization unit to both 4, and a supply system 28, 44 for supplying the sterilization gas.FIELD 1【課題】内視鏡の外部及び内部に堆積した細菌を確実に殺菌することができる滅菌装置及び滅菌方法を提供する。【解決手段】滅菌対象物Aを収容可能な第一滅菌部2と、滅菌対象物Aを収納する袋Bを収納可能な第二滅菌部4と、第一滅菌部2、及び第二滅菌部4の双方に、滅菌ガスを供給する供給系統28,44とを備える。【選択図】図1