An endoscope reprocessor includes: a treatment tank 11 configured to allow an endoscope E to be disposed inside a connector 21 including an opening 22 inside the treatment tank 11 a first conduit 31 extending from the connector 21 an on-off valve 41 disposed in the first conduit 31 a leak tester 61 and a second conduit 71 including a conduit body having a conduit resistance that is higher than a conduit resistance of the first conduit 31.
