A ligator for ligating body duct(s), said ligator enabling quick, easy and damage-free repetition of ligation and release of one or more body ducts in a body cavity through an operation outside the body cavity, and having an excellent performance of blocking the flow of a body fluid such as blood or lymph in a body duct. In an abdominal surgery, the ligator can be provided at such a position as not disturbing the surgery per se or hindering the vision during the surgery, while leaving the back-end thereof outside the body cavity, and can be operated outside the body cavity. In an endoscopic surgery, the ligator can be inserted from an opening that is a surgical wound while leaving the back-end thereof outside the body cavity, and can be operated outside the body cavity.
