An endoscope washing and disinfecting apparatus includes: a connecting portion connected to a bending transmitting portion of an endoscope to transmit driving force a distal end driving portion for transmitting the driving force to the bending transmitting portion through the connecting portion a fluid supplying unit for supplying gas into an inner space of the endoscope and a control unit for controlling a pressure detecting portion for detecting pressure in the inner space and the distal end driving portion to provide the bending portion with bending motion, and for determining occurrence or nonoccurrence of water leak in the endoscope by comparing the pressure detected by the pressure detecting portion and a preset threshold.
