Secondary battery and method of manufacturing the same

A secondary battery (1) according to an embodiment includes a container (3) having a pouring hole (7) through which an electrolyte is poured, and housing the electrolyte, poured through the pouring hole (7), together with an electrode body (2); and a sealing lid (9) fixed to the container (3) and closing the pouring hole (7). The container (3) has a plurality of grooves (8) extending in parallel along the outer edge of the pouring hole (7), in a predetermined region that surrounds the periphery of the pouring hole (7), and the sealing lid (9) is provided on the plurality of grooves (8) in such a manner as to close the pouring hole (7) and is fixed to the container (3).