An endoscope reprocessor includes: an endoscope information reading section configured to read endoscope information from each of endoscopes; a treatment tank in which the endoscopes are disposed; a number detection section configured to detect a number of the endoscopes disposed in the treatment tank; a determination section configured to determine whether a first number that is the number of endoscopes read by the endoscope information reading section is equal to a second number that is the number of the endoscopes detected by the number detection section; a notification section configured to execute error notification; and a control section connected with the determination section and the notification section, and configured to drive the notification section when the determination section determines that the first number is different from the second number.