SEALED BATTERY AND BATTERY JACKET CAN

There is provided a sealed battery having excellent corrosion resistance and sealing performance. The sealed battery 1 includes a battery jacket can 2 having a bottom and being in a cylindrical or polyhedral shape. The battery jacket can 2 also serves as a collector of one of the electrodes. The battery jacket can 2 has an opening pointing upwards and accommodates active parts (3, 4, 5 and 20). The opening is sealed by a sealing part 10 that includes a flat metal sealing plate 6, a gasket 9 made of an insulator, and a terminal part 7 of the other electrode. In the sealing part, the terminal part is attached to the sealing plate 6 using the gasket 9. The sealing plate has a planar shape that matches a shape of the opening of the battery jacket can. The sealing plate is in a saucer shape whose edge section is bent upwards. An upper end of the edge section of the sealing plate is laser-welded to an upper end of the battery jacket can while the sealing plate being inserted inside the opening of the battery jacket can. The battery jacket can is made of ferritic stainless steel to which Tin (Sn) is added.