PROBLEM TO BE SOLVED: To provide a washing tube of an endoscope capable of reliably preventing foreign material matters from entering into an endoscope conduit and supplying a sufficient amount of fluid with a sufficient flow rate and pressure for the washing and disinfection of the interior of the endoscope conduit.SOLUTION: The washing tube of an endoscope comprises: a main conduit 51 that connects the endoscope conduit and a washing/disinfection device to each other, supplies fluid F sent from the washing/disinfection device to the interior of the endoscope conduit, and at least parts of which include curvature travel portions 51c and 51d, and travel-direction variation portions 51a and 51b consecutively provided from the curvature travel portions 51c and 51d and is formed by being spirally wound and a sub conduit 52 that is protrudingly provided at the travel-direction variation portion 51b along a tangential direction E of the curvature travel portion 51c, communicated to the main conduit 51, has a closed protrusion end 52t, and stores foreign matters W in the fluid F flowing the main conduit 51 by centrifugal force of the fluid F flowing the main conduit 51.
