PROBLEM TO BE SOLVED: To provide a preliminary washing device for endoscopes improving workability of preliminary washing in the preliminary washing device for endoscopes performing the preliminary washing of endoscopes.SOLUTION: The preliminary washing device for endoscopes comprises a control unit 3 including: an air pump 31 for discharging compressed air a circulation pump 32 for circulating wash solution at a part between an endoscope 50 and a washing tank 21 a PLC (Programmable Logic Controller) 34A for controlling the operations of the air pump 31 and the circulation pump 32 and a housing 35 including the air pump 31, the circulation pump 32, and the PLC (the controller) 34A.
