To provide a suture instrument for an endoscope which can lift a diseased tissue in a wide range for performing en bloc resection of the diseased tissue in full thickness.A suture instrument for an endoscope which is attachable to an endoscope that is able to be inserted into a body cavity from a distal side, includes: a device including a lift instrument that grasps a living tissue located at a predetermined grasping position to lift the living tissue in a thickness direction of the living tissue, and a forward expansion section that pinches the living tissue lifted by the lift instrument and a suture device that sutures the living tissue pinched in the device, wherein the forward expansion section includes a living-tissue-introducing section that extends and retracts in a direction intersecting the living tissue lifted by the lift instrument to be contacted with the living tissue.
