A medical manipulator includes: an end effector provided at a distal side of the medical manipulator； a proximal housing provided at a proximal side of the medical manipulator； and an elongated portion coupled to both the end effector and the proximal end. The elongated portion includes: a first elongated member coupled to both the end effector and the proximal housing； a second elongated member coupled to only either one of the end effector and the proximal housing, the second elongated member being configured to form by surrounding the first elongated member； and to be slidable in a longitudinal direction relative to the first elongated member； and a third elongated member coupled to both the end effector and the proximal housing, the third elongated member being configured to form an exterior of the elongated portion by surrounding the second elongated member.
