An endoscopic treatment instrument having a treatment portion having: an input member a first link disconnectably connected to the input member a first control plate disposed in a first connecting portion, inserting the input member through the first control plate, and engaging the input member by inclination of the first control plate a first forceps member opening and closing according to advancing and retracting motions of the first link a second link disconnectably connected to the input member a second control plate disposed in a second connecting portion, inserting the input member through the second control plate, and engaging the input member by inclination of the second control plate and a second forceps member opening and closing according to advancing and retracting motions of the second link, the opening-and-closing angle of the second forceps member being less than that of the first forceps member.
