A cathode lid of a battery container having a peripheral portion U letter shaped in section, with the outer peripheral side formed thicker than the inner peripheral side, and a side formed thicker than the inner peripheral side, and a method of manufacturing the same. In a process of manufacture of the anode lid, the periphery of a blank of a disk is bent in one direction vertical to the surface thereof, thereby to achieve a structure of a vessel having a bent periphery and then the vessel structure is subjected to paired working processes of punch and knockout, whereby a pressing force is exerted so that the edge of the bent periphery and the central portion of the main flat portion of the blank comes to to be close to each other in the direction vertical to the surface of the blank. As a result, the periphery is formed to be U letter shaped in section, while the central portion is maintained flat.
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