PROBLEM TO BE SOLVED: To provide a sterilization method of an ozone water sterilization machine capable of suppressing residue of a detergent in a sterilization tank after a detergent washing operation.SOLUTION: A washing sterilization processing operation of an endoscope sterilization machine 1 comprises: a detergent washing step (step ST12) for washing an endoscope 10 stored in a sterilization tank 2 by washing water obtained by dissolving a detergent to raw water； a washing water discharge step (step ST2) for discharging the washing water； a sterilization raw water supply step (step ST51) for supplying the raw water to the sterilization tank 2； an ozone water generation step (step ST52) for injecting an ozone gas into the raw water for generating ozone water； and a sterilization step (step ST5) for sterilizing the endoscope 10 by the ozone water. In the washing water discharge step (step ST2), a shower rinsing operation (step ST211) for spraying the raw water in a shower state to an exposed part of the endoscope 10 exposed upward from a water surface of the washing water following to reduction of a water level of the washing water, is executed.SELECTED DRAWING: Figure 5COPYRIGHT: (C)2020,JPO&INPIT【課題】洗剤洗浄動作の後に消毒槽内における洗剤の残留を抑制できるオゾン水消毒機の消毒方法を提案すること。【解決手段】内視鏡消毒機１の洗浄消毒処理動作は、消毒槽２に収容した内視鏡１０を、原水に洗剤を溶解させた洗浄水で洗浄する洗剤洗浄工程（ステップＳＴ１２）と、洗浄水を排出する洗浄水排水工程（ステップＳＴ２）と、消毒槽２に原水を供給する消毒用原水供給工程（ステップＳＴ５１）と、原水にオゾンガスを注入してオゾン水を生成するオゾン水生成工程（ステップＳＴ５２）と、オゾン水で内視鏡１０を消毒する消毒工程（ステップＳＴ５）と、を有する。洗浄水排水工程（ステップＳＴ２）では、洗浄水の水位の低下に伴って洗浄水の水面から上方に露出する内視鏡１０の露出部分に、原水をシャワー状に浴びせるシャワーすすぎ動作（ステップＳＴ２１１）を行う。【選択図】図５
