Abstract: A surgical instrument for ligating tubular organs in deep body-cavities in which there are three, elongated, mutually-movable, mutually-parallel elements one element carrying a magazine of U-shaped staples, another element including a movement-limiter serving as a pusher for forcing staples out of the magazine, and the third element serving as a supporting member fitted with a needle-shaped die formed as a hook for grasping and orienting the tubular organ being ligated; the element with the staple magazine having at its end a spring mechanism for pressing and fixing the grasped portion of the tubular organ being ligated as the first and third elements move relative to each other.