A water evacuating tube for washing an electric knife of the present invention includes a heat resistant tube main body, in which front and rear ends are open, and an inside in an axial direction is a hollow portion in which the electric knife is disposed and held. In a peripheral wall of the tube main body, a lumen for pouring water is disposed in the axial direction, and a front end portion of the tube main body is provided with a pouring water aperture for dropping the water from the lumen onto an electrode of the electric knife.