Abstract: An endoscope connector comprises a socket member which has a cylindrical penetrating bore, that portion of said socket member at which one end of the penetrating bore is opened being connected to a console containing a light source and a connection for an electric source, and whose peripheral wall is provided with a fluid-feeding fitting and suction fitting; a cylindrical plug member which is sealingly inserted into the cylindrical penetrating bore of the socket member to rotate around the axis, receives the distal end portions of an illumination optical fiber bundle, fluid-feeding tube and suction tube extending from an endoscope, said plug member having one end which is near the other end of the socket member and to which the free end of a protection tube receiving the illumination optical fiber bundle, fluid-feeding tube and suction tube is fixed; and a pair of annular chambers which are formed between the surface of the cylindrical penetrating bore of the socket member and the peripheral surface of the pl

Abstract: An endoscope is equipped with a tube consisting of at least two layers and having a passage through which forceps or catheter is inserted. One layer constituting an inner layer is made of a relatively rigid material whose frictional coefficient is small. The other layer constituting an outer layer is made of a flexible or pliable material and is thicker than the inner layer.