A connector 41 serving as an endoscope connector has an outer cylindrical member 51, an inner cylindrical member 52, and a pressing member 53. The outer cylindrical member 51 has a flow inlet opening 61 to which an endoscope cleaning and sterilizing device 1 is connected, a flow outlet opening 62, a flow passage P, an inner peripheral section 63a which is provided inside the inner periphery of the flow passage P, and an inner peripheral section 63b which is provided closer to the flow outlet opening 62 than the inner peripheral section 63a and which has a larger inner diameter than the inner peripheral section 63a. The inner cylindrical member 52 includes: a forwardly and backwardly movable section 52a disposed movable forward and backward along the flow passage P and having a smaller outer diameter than the inner peripheral section 63b an O-ring 54 disposed on the outer periphery of the forwardly and backwardly movable section 52a and filling the gap between the forwardly and backwardly movable section 52a and the inner peripheral section 63a when the forwardly and backwardly movable section 52a is disposed in the inner peripheral section 63a and a through-passage 65 passing through the forwardly and backwardly movable section 52a along the flow passage P.Linvention concerne un connecteur 41 servant de connecteur dendoscope qui a un élément cylindrique externe 51, un élément cylindrique interne 52 et un élément de pression 53. Lélément cylindrique externe 51 a une ouverture dentrée découlement 61 à laquelle un dispositif de nettoyage et de stérilisation dendoscope est relié, une ouverture de sortie découlement 62, un passage découlement P, une section périphérique interne 63a qui est située à lintérieur de la périphérie interne du passage découlement P, et une section périphérique interne 63b qui est située plus près de louverture de sortie découlement 62 que la section périphérique interne 63a et qui a un diamètre interne plus grand que la section périphérique int
