A plurality of joints are arranged at regular intervals, and each of the joints is connected to a plurality of wires arranged radially with respect to the center in the lengthwise direction of the front and the back, and the joints are arranged at regular intervals along the longitudinal direction of the wires A link portion including a plurality of guide plates for supporting the wires and preventing twisting of the wires, and an outer covering surrounding the joint portions, the wires, and the guide plates along the longitudinal direction of the link portions, An engaging end portion formed at a front end of the link portion and selectively engaging a tool according to the purpose of use； and a rear end portion provided at a rear end of the link portion, wherein the engaging end portion is connected to the plurality of wires, An operating portion for adjusting the curvature of the link portion, And the screw is connected to the joints by a screw so that the joint is selectively linearly moved by forward rotation or reverse rotation of the screw in accordance with forward or reverse rotation by the user so that the length of the endoscope is elongated or contracted Since the length of the endoscope can be expanded and reduced by including the length adjusting wire, it is possible to reduce the work space for the endoscope to perform the desired work, thereby preventing damage to the surrounding organs during the work, In addition, it is possible to secure diversity in the detailed operation area determined by the kinematic structure, and to secure high working characteristics of the tool (work tool) fastened to the endoscope end, The length of the endoscope being variable.본 발명은 복수 개의 관절부를 일정한 간격으로 배치하고, 각각의 관절부는 전, 후 길이방향의 중심을 기준으로 방사상으로 배치된 복수 개의 와이어와 연결하며, 상기 와이어들의 길이방향을 따라 일정한 간격으로 배치하여, 상기 와이어들을 지지하면서 와이어의 꼬임을 방지하는 복수 개의 가이드플레이트를 포함한 링크부와, 상기 링크부의 길이방향을 따라 관절부, 와이어, 및 가이드플레이트들을 감싸는 외피를 이루어 상기 관절부, 와이어, 및 가이드플레이트들을 보호하는 외피부재와, 상기 링크부의 전단에 형성하고, 도구를 사용목적에 따라 선택적으
