A washing tube 40 of the present invention is a washing tube for supplying a washing and disinfecting fluid to an endoscope conduit of an endoscope 100 placed in an endoscope washing and disinfecting apparatus 1, includes: a tube body 67, one end of which is connected to fluid supply sections 33 and 34 of the endoscope washing and disinfecting apparatus for sending a fluid, a connector section 41 disposed at the other end of the tube body and loosely and detachably fitted to a base 101 of the endoscope conduit, a sealing member 82 that is provided inside the connector section and comes into close contact with the base to keep the base and the connector section connected in a watertight manner, a valve body 63 that moves forward by a liquid sending pressure of the supplied fluid and a biasing member 62 provided inside the connector section for biasing the valve body backward.
