PROBLEM TO BE SOLVED: To provide a minimally invasive surgical device capable of giving a high degree of freedom to a tip portion and a shaft. SOLUTION: An operation handle portion operated by a user in a body cavity, a treatment unit inserted into the body cavity and holding a predetermined surgical instrument operated by the operation unit in a replaceable manner, an operation handle portion and the treatment unit. It has a connecting portion for arranging the surgical instrument provided between the treatment portions and held by the treatment portion at a desired position in the body cavity in a desired posture, and the connecting portion is serialized in the long axis direction of the connecting portion. At least two or more connecting parts and the two or more connecting parts that are connected to each other and constitute a joint that enables rotation around the long axis or around an axis that is orthogonal to the long axis are moved in a direction that is close to or separated from each other. As a result, a connecting portion control mechanism that opens or constrains the angle around the long axis of the joint and / and the angle around the axis orthogonal to the long axis, thereby arranging the treated portion at a desired position and posture in the body cavity. And have. [Selection diagram] Fig. 1【解決課題】 先端部及びシャフトに高い自由度を与えることを可能とする低侵襲性手術機器を提供する。【解決手段】 体腔内でユーザが操作する操作ハンドル部と、体腔内に挿入され前記操作部によって操作される所定の手術器具を換装可能に保持する処置部と、操作ハンドル部と前記処置部との間に設けられ前記処置部が保持する手術器具を体腔内の所望の位置に所望の姿勢で配置するための連結部とを有し、前記連結部は、連結部の長軸方向に直列的に接続され、長軸回り若しくは長軸と直交する軸回りの回動を可能にする関節を構成する少なくとも２以上の接続部と、前記２以上の接続部を互いに近接若しくは離間する方向に移動させることで、前記関節の長軸回りの角度若しくは／及び長軸と直交する軸回りの角度を開放若しくは拘束し、それにより前記処置部を体腔内の所望の位置及び姿勢で配置する連結部制御機構とを有するものである。【選択図】 図１
