An intestinal anastomotic surgery aid 1 is constituted with a cylindrical portion 40 for covering the proximal end side of an engaging rod 28, and a cover portion 41 that extends from the cylindrical portion 40 towards the distal end side of the engaging rod 28. The proximal end part of the cylindrical portion 40 is inserted to a recessed portion 26 of a device main body 21 to be held to the device main body 21. The anus-side piece of the intestine is tied with a suture to be held to the outer face of the cylindrical portion 40.
