PROBLEM TO BE SOLVED: To avoid splashing water onto objects to be washed when water is supplied to a reservoir before draining waste water from a hot water sterilization process, in order to prevent a water draining system from deterioration by the heat of hot water.SOLUTION: A washing device 10 includes a washing tank 20 to accommodate medical instruments above a water reservoir 21 to store washing water at the bottom, a washing water supply means 28 for supplying water from its source to the reservoir 21 as a part of the washing water through a supply port 20a formed on the inner circumferential wall of the washing tank 20, a hot water supply means 40 for supplying hot water to the reservoir 21, washing nozzles 24, 25 to jet the washing water from the reservoir 21 to medical instruments, a washing pump 27 to send the washing water of the reservoir 21 to the washing nozzles 24, 25, and a drainage pipe 34 provided near a drainage pump 35 as a means for draining the washing water. The washing tank 20 includes a guide nozzle 31 and a guide plate 32 as a water guide means that prevents the water supplied into the washing tank 20 through a supply port 20a from scattering to the side of objects to be washed that are placed within the washing tank 20, and guides it into the reservoir 21.COPYRIGHT: (C)2013,JPO&INPIT【課題】排水手段を熱湯の熱によって劣化させにくくするために、熱湯消毒工程の排水をする前に貯水部に水を供給したときに、被洗浄物に水がかからないようにする。【解決手段】洗浄装置10は、下部に洗浄水を貯える貯水部21の上側に医療用器具を収容する洗浄槽20と、洗浄槽20の内周壁に形成された給水口20aから貯水部21に給水源の水を洗浄水の一部として供給する洗浄水供給手段28と、貯水部21に湯を供給する熱湯供給手段40と、医療用器具に貯水部21の洗浄水を噴射する洗浄ノズル24、25と、貯水部21の洗浄水を洗浄ノズル24、25に送出する洗浄ポンプ27と、洗浄水を排水する排水手段として排水ポンプ35を介装した排水管34とを備え、洗浄槽20には給水口20aから供給される水を洗浄槽20内に収容した被洗浄物側に飛散するのを防止して貯水部21に案内するガイド手段として、ガイドノズル31とガイド板32とを設けた。【選択図】図1