To provide a salivary duct which reaches a place where saliva is accumulated most in a patient's mouth varying individually and does not give a pain even at the time of being abutted on a sensitive mucous membrane part.

A tube 1 with a semicylindrically bent tip is put through a tube 2 which is suited to the pipe 1 and smoothly movable on the tube 1, the tip of the tube 1 is expanded outward, a flexible tube 3 suited to the tube 2 is adhered to the tube 2 and a flexible cap 4 provided with small holes at its tip is adhered to the tube 3.