A gas separation membrane element which separates a specific gas from a source gas containing the specific gas, the gas separation membrane element comprising: a sealing portion for preventing mixture of the source gas and the specific gas permeated through the gas separation membrane; and a laminate in which at least one gas separation membrane, at least one feed-side flow channel member, and at least one permeate-side flow channel member are laminated and being rolled around a central tube, the feed-side flow channel member to which the source gas is fed, the permeate-side flow channel member in which the specific gas permeated through the gas separation membrane flows, the central tube in which the specific gas flowing in the permeate-side flow channel member is collected, the gas separation membrane including a first porous layer including a porous membrane, and a hydrophilic resin composition layer selectively permeating the specific gas contained in the source gas, the first porous layer being formed from a resin material including at least one kind of resin selected from the group consisting of polyethylene, polypropylene, fluorine-containing resin, polystyrene, polyethylene terephthalate, polyethersulfone, polyphenylene sulfide, polysulfone, polyimide, polyetherimide, and polyetheretherketone (PEEK), the hydrophilic resin composition layer being disposed on the first porous layer and being a gelled thin film, the sealing portion being a region in which a cured material of a sealant penetrates in at least the permeate-side flow channel member and the first porous layer, and having an envelope shape at end portions corresponding to both ends of the gas separation membrane in a direction parallel to an axis of the central tube, and an end portion corresponding to an end portion located on the periphery side of the wound body among end portions corresponding to both ends of gas separation membrane in a direction vertical to the axis of the central tube, the sealant including an epoxy-based resin, a thermal expansion coefficient A of the sealing portion and a thermal expansion coefficient B of a material forming the first porous layer satisfying a relation: 0.35 ≤ A / B ≤ 1.0 a sealing portion for preventing mixture of the source gas and the specific gas permeated through the gas separation membrane; and a laminate in which at least one gas separation membrane, at least one feed-side flow channel member, and at least one permeate-side flow channel member are laminated and being rolled around a central tube, the feed-side flow channel member to which the source gas is fed, the permeate-side flow channel member in which the specific gas permeated through the gas separation membrane flows, the central tube in which the specific gas flowing in the permeate-side flow channel member is collected, the gas separation membrane including a first porous layer including a porous membrane, and a hydrophilic resin composition layer selectively permeating the specific gas contained in the source gas, a first porous layer including a porous membrane, and a hydrophilic resin composition layer selectively permeating the specific gas contained in the source gas, the first porous layer being formed from a resin material including at least one kind of resin selected from the group consisting of polyethylene, polypropylene, fluorine-containing resin, polystyrene, polyethylene terephthalate, polyethersulfone, polyphenylene sulfide, polysulfone, polyimide, polyetherimide, and polyetheretherketone (PEEK), the hydrophilic resin composition layer being disposed on the first porous layer and being a gelled thin film, the sealing portion being a region in which a cured material of a sealant penetrates in at least the permeate-side flow channel member and the first porous layer, and having an envelope shape at end portions corresponding to both ends of the gas separation membrane in a direction parallel to an axis of the central tube, and an end portion corresponding to an end portion located on the periphery side of the wound body among end portions corresponding to both ends of gas separation membrane in a direction vertical to the axis of the central tube, the sealant including an epoxy-based resin, a thermal expansion coefficient A of the sealing portion and a thermal expansion coefficient B of a material forming the first porous layer satisfying a relation: 0.35 ≤ A / B ≤ 1.0