Endoscope reprocessor

An endoscope reprocessor comprising:

• a processing tank including a first tank that has a predetermined capacity and is arranged at a lowermost tier, and a second tank that communicates with the first tank, the processing tank allowing an endoscope to be placed in the processing tank;
• a drainage port arranged in the first tank;
• a restriction portion that restricts the endoscope from entering the first tank;
• a first water level detection section that detects whether or not a first water level set to be a water level that is equal to or below a boundary between the first tank and the second tank is submerged in water;
• a circulation port that opens at a level that is below the first water level and is a predetermined distance above a bottom face of the first tank in the processing tank;
• a circulation conduit including one end connected to the circulation port and another end that opens at a position that is above the first water level in the processing tank;
• and
• a circulation pump that transfers a fluid in the circulation conduit from the one end toward the other end.