According to the present invention, a secondary battery comprises: a metal can having an accommodating portion for accommodating an electrode assembly and an electrolyte, as well as an open portion; a metal cap arranged on the open portion of the can to seal the can; and a fuse-joining member having a melting point lower than the melting point of the can and the cap, and which is fuse-joined to the can and the cap when the fuse-joining member is arranged in the joining portion between the can and the cap, and/or when the fuse-joining member surrounds the joining portion.
