An endoscope cleaning/disinfecting apparatus includes: a cleaning/disinfecting tank, a first detection section, a second detection section, a cleaning/disinfecting section, a cleaning/disinfecting detection section, an alerting section, a determination section that if, after reception of the endoscope in the cleaning/disinfecting tank is detected by the first detection section, removal of the endoscope from the cleaning/disinfecting tank is detected by the second detection section despite no detection of driving of the cleaning/disinfecting section by the cleaning/disinfecting detection section, determines that the uncleaned/undisinfected endoscope is removed from the cleaning/disinfecting tank, and a control section that if it is determined by the determination section that the uncleaned/undisinfected endoscope is removed, drives the alerting section to issue a warning.
