PROBLEM TO BE SOLVED: To provide an endoscope storage cabinet capable of preventing breeding of bacteria in an internal conduit of an endoscope.SOLUTION: An endoscope storage cabinet 1 comprises: an ozone generator 25 an ozone supply pipe 34 extending through the ozone generator 25 an ozonolysis box 32 for storing an ozonolysis catalyst 61 which decomposes ozone and a pump 24. The ozone supply pipe 34 is connected detachably to an air supply/water supply cylinder 107 which communicates with an air supply/water supply channel 105 (internal conduit) of an endoscope 100. The ozonolysis box 32 is connected to a nozzle 109 of the air supply/water supply channel 105. When the ozone supply pipe 34 and the ozonolysis box 32 are connected to the endoscope 100, a first air flow channel A is formed of the ozone supply pipe 34, the air supply/water supply channel 105, and the ozonolysis box 32. The pump 24 generates an air stream in the first air flow channel A and lets ozone generated by the ozone generator 25 flow through the air supply/water supply channel 105. Thereby, the air supply/water supply channel 105 is sterilized by the ozone.
