A minimally invasive surgical device characterized by comprising: a manipulable handle (2) manipulated by a user inside a body cavity, a treatment part (3) that holds a specific swappable surgical instrument that is inserted into the body cavity and manipulated using the manipulable part, and a linking part (4), provided between the manipulable handle and the treatment part, for disposing the surgical instrument held by the treatment part in a desired orientation at a desired position within the body cavity. The linking part comprising: two or more connecting parts (7a, 7b, 8a, 8b) that are connected in series in the longitudinal direction of the linking part, and form a joint (7, 8) that enables rotation around the longitudinal axis or an axis orthogonal to the longitudinal axis; and a linking part control mechanism that moves the two or more connecting parts toward or away from each other to open or constrict the angle of the joint around the longitudinal axis and/or the angle thereof around an axis orthogonal to the longitudinal axis, thereby disposing the treatment part at the desired position and in the desired orientation within the body cavity.
