While achieving a reduction of sterilization work time, it can be a proper temperature distribution to provide a steam sterilizer. And accommodating the object to be sterilized, the sterilization chamber 32 for performing a sterile object to be sterilized by maintaining the steam supplied at a predetermined temperature and a predetermined pressure, the feeding 41 for supplying steam into the sterilization chamber 32, feed In the steam sterilization apparatus 30 includes a feed valve 44 to control the steam flow through the 41, is provided in the paper 41, in the sterile tank 32 can perform in 100kPa / min or more of pressure rise rate caliber In the conditioning step of repeating the introduction and evacuation of steam sterilization tank 32, feed it is controlled to be fully opened valve 44, in the sterilization step after the conditioning step, and so as to have a predetermined steam supply amount a control unit 74 which controls the opening of the supply valve 44 to I provided.滅菌作業時間の短縮を図りつつ、適正な温度分布とすることができる蒸気滅菌装置を提供する。被滅菌物を収容し、供給される蒸気を所定温度・所定圧力で維持することによって被滅菌物に滅菌を施す滅菌槽32と、滅菌槽32内に蒸気を供給する給蒸管41と、給蒸管41を流れる蒸気流量を制御する給蒸管バルブ44とを具備する蒸気滅菌装置30において、給蒸管41を、滅菌槽32内が100kPa/min以上の圧力上昇速度で実行できる口径に設け、滅菌槽32内に蒸気の導入及び排気を繰り返し行うコンディショニング工程においては、給蒸管バルブ44を全開となるように制御し、コンディショニング工程後の滅菌工程においては、所定の蒸気供給量となるように給蒸管バルブ44の開度を制御する制御部74を設けた。
