The present invention relates to a endoscope washer, including a basin for receiving an endoscope to be washed; a rack which secures thereto a portion of the endoscope and moves vertically within the basin; a drive unit for vertically moving the rack; a positioning member for adjusting a rack stopping position when the endoscope is to be set on the rack; and a drive control unit for controlling the drive unit based on computed results from the positioning member. For the endoscope washer, user may set the endoscope effectively and simply. In addition, the endoscope washer can blow air into the basin after completing the process of cleaning, disinfecting and flushing, to restrain the dilution/deterioration and reduce of used-repeatedly disinfecting liquid suitably.