An endoscope washing and disinfecting apparatus (1) includes an apparatus main body (2) equipped with a washing bath (4) in which an endoscope (101) is mounted a nozzle unit (70) provided so as to face a connector portion (104) of an endoscope conduit provided in the endoscope mounted in the washing bath, to which fluid within the apparatus main body is supplied so that the nozzle unit advances due to pressure of the fluid, and which supplies the fluid to inside the endoscope conduit by connecting to the connector portion and an automatic brush mechanism (80) that is provided in the apparatus main body and that carries out brushing and cleaning within the endoscope conduit by introducing a cleaning brush (81) into the endoscope conduit through the nozzle unit and moving the cleaning brush (81) forward and rearward.
