A reprocessing method for balloon endoscopes, the method including introducing a balloon endoscope to be reprocessed into an endoscope reprocessing system, performing reprocessing on the balloon endoscope to be reprocessed while a balloon of the balloon endoscope is deflated, thereafter inflating the balloon of the balloon endoscope, thereafter deflating the balloon of the balloon endoscope and thereafter performing further reprocessing on the balloon endoscope to be reprocessed while the balloon of the balloon endoscope is deflated.