Endoscope reprocessor

An endoscope reprocessor comprising:

• a medicinal solution storage portion configured to store a medicinal solution;
• a sampling tube including a first end portion opened at or below a predetermined water level inside the medicinal solution storage portion, and a second end portion opened at a position higher than the predetermined water level, the second end portion being outside the medicinal solution storage portion;
• a first chamber including a first opening and a second opening, the first opening communicating with, the second end portion of the sampling tube;
• a second chamber having an opening portion and a communication port connectable to the second opening of the first chamber;
• a constricted portion provided in the second opening of the first chamber, the constricted portion being provided with an inner diameter smaller than an inner diameter of the first chamber;
• a moving portion configured to advance and retreat inside the first chamber between a first position to block the second opening and a second position to open the second opening, the second position being farther away from the second opening than the first position;
• an energizing portion that energizes the moving portion in a direction from the second position to the first position;
• and
• a retention portion arranged at one of the constricted portion or the first moving portion, the retention portion being configured to be in close contact with one of an inner surface of the second opening or with an inner surface of the first chamber when the moving portion is at the first position.