A ligature device for medical treatment has an operating device that has a ligature tool for medical treatment fitted onto a distal end portion thereof. The operating device is provided with a cutting member that is able to move freely backwards and forwards and is used to cut a ligature wire of the ligature tool for medical treatment. A distal end side of the cutting member has an inclined end portion that is inclined relative to the direction of forward and backward movement, and a blade portion is provided in this inclined end portion.
