To provide a jig capable of easily conducting packaging work for a multipack.

Four outer face plates 5, 5, (6, 6) are connectively provided in a rectangularly cylindrical state to form an outer circumferential wall 18 and inner face plates 9, 11 are provided connectively at the respective upper edges of the outer face plates 5, (6) with the aid of inward plates 8, 10. By successively folding the inward plates 8, 10 inward and the inner face plates 9, 11 downward, a hollow place 19 is formed which is surrounded by the four inner face plates 9, 9, 11, 11. Further, it is so designed that both side plates 52, 52 of a multipack 50 are drawn near to each other by the opposed inner face plates 9, 9 when the multipack 50 in a stretched state is pushed into the hollow place 19 with a bottle B while controlling the movement of the inner face plates 9, 11.