PROBLEM TO BE SOLVED: To provide a bag-like aid and an aid for a diaper which minimize changes of the whole diaper due to discharge of feces.SOLUTION: This aid is shaped like a bag and comprises an adhesive part 1b at a bag opening 1a so as to attach, in advance of wearing a diaper, the bag opening 1a to a skin surface around the anus Ma of a wearing person M in a manner to receive the feces into the bag without leakage. The adhesive part is formed into an area which is between a virtual first circle and a virtual second circle larger in diameter than the first circle and substantially concentric with the first circle, the area being also between a virtual tangent of the second circle and the first circle on one side of the center of the circles and excluding the outside of a virtual straight line parallel to the tangent. The feces are received into the inside of the first circle.
