An endoscope reprocessor includes: a filtering tool including: a main body portion provided with a channel connecting a lead-in portion and a lead-out portion a filter portion provided in the channel and a first check valve provided in the channel a processing tank a tank that stores a disinfecting liquid a lead-out conduit that guides the fluid led out from the lead-out portion to the processing tank a second check valve with a distal end connected to the lead-out conduit a first conduit with a distal end connected to the second check valve and a proximal end connected to the tank and an injection pump that transfers the disinfecting liquid in the tank from the proximal end toward the distal end of the first conduit.
