According to the present invention, there is provided a connector laid within a manhole wall for connecting cable-protecting pipes, including a body formed with a passage which said pipes can be inserted into, and a fixing member and a coupling member formed on both ends of said body, respectively, to be coupled and fixed each other, wherein said fixing member includes a first fixing protrusion and a first fixing groove formed on an outer surface of said body, respectively, to be located at the same surface as an end surface of said body and a second fixing protrusion and a second fixing groove formed on the outer surface of said body, respectively, to be located apart from the end surface of said body by a thickness of said first fixing protrusion and said first fixing groove. The end of said body formed with said fixing member is provided with a cover for preventing extraneous substance from invading inside of said body. An inner surface of said body is formed with a fixing sill to be inclined outward so that said fixing sill should engage with a slope of an end of said pipe inclined inward.