An endoscope cleaning/disinfecting apparatus includes: a cleaning/disinfecting tank a cover portion a facing portion an approach portion a central portion an acceleration sensor detecting an acceleration change pattern at time of the cover portion moving from an open position to a closed position an informing section and a control section, when the acceleration change pattern detected by the acceleration sensor is different from a set pattern at the time of the cover portion moving from the open position to the closed position, judging that the approach portion comes into contact with the cleaning/disinfecting target and performing warning control of the informing section. A shortest distance between the approach portion and the cleaning/disinfecting tank at time of the approach portion being fitted into a hollow portion at the closed position is less than 3.2 mm.
