An endoscope cleaning/disinfecting apparatus connector according to the present invention includes a cleaning/disinfecting apparatus connection section, a circulating section and a discharge section, wherein the discharge section communicates with the circulating section and includes a first channel that discharges a fluid R that passes through the circulating section into a pipe sleeve, a second channel that branches from the first channel and discharges the fluid R to the periphery of the pipe sleeve, and an opening/closing section that is provided in a branch section that branches from the first channel to the second channel or in the second channel, is freely expandable/contractible according to a flow rate of a fluid and blocks the second channel when the flow rate of the fluid is a predetermined amount or higher.
