Secondary battery and method of manufacturing the same

A secondary battery according to an embodiment includes a container having a pouring hole through which an electrolyte is poured, and housing the electrolyte, poured through the pouring hole, together with an electrode body; and a sealing lid (8) which is fixed to the container and is closing the pouring hole. The sealing lid (8) has a welding mark (8e) existing in a ring shape with a depth through the sealing lid (8) to a lid body (3b) of the container, and an inner circumferential side molten mark (8f) existing in a ring shape overlapping with the welding mark (8e), on the inner circumferential side of the welding mark (8e) in the sealing lid (8), with a depth corresponding to the thickness of the sealing lid (8).