Secondary Battery and Method for Manufacturing the Same

A secondary battery according to the present invention comprises a pouch comprising an accommodation part accommodate the electrode assembly, a gas pocket part collecting a gas generated in the accommodation part, an edge sealing part provided along each of edge surfaces of the accommodation part and the gas pocket part, and a corner sealing part provided on each of both ends of a boundary between the accommodation part and the gas pocket part to support the electrode assembly accommodated in the accommodation part, wherein the corner sealing part comprises a full-width support surface supporting one end in a full-width direction of the electrode assembly, which faces the gas pocket part, and a full-length support surface provided between the full-width support surface and the edge sealing part, having a width greater than that of the full-width support surface, and supporting one end in a full-length direction of the electrode assembly, which faces the edge sealing part, and the full-length support surface, the full-width support surface, and the edge sealing part are integrally connected to each other.