PROBLEM TO BE SOLVED: To provide an end sealing jig, the end sealing means when using a potting system of a centrifugal molding method, capable of reducing an amount of a hollow-fiber membrane and a filler leaving as wastes in a cutting process by directly applying a small amount of the filler such as a thermoplastic resin to an end face of the hollow-fiber membrane, producing no new waste by using repetitively, and capable of maximizing cost reduction effects, and a manufacturing method of the hollow-fiber membrane module using the end sealing jig.SOLUTION: End sealing jigs 10 to be attached to both ends of a cylindrical container, when sealing both-end openings of a hollow-fiber membrane bundle 3 stored in the cylindrical container and both-end openings of the cylindrical container, have a cylindrical shape, and include circular openings concentric about the axial direction stepwise penetrating therein. When (a) is an opening diameter of an end to be engaged with the cylindrical part of the hollow-fiber membrane module, b is an opening diameter of the other end, and c is an opening diameter of parts other than both ends, the relationship of b
