A lithium-ion rechargeable battery 1 includes a battery part 10 which performs charging and discharging using lithium ions, and a shell 30 for housing the battery part 10 in the interior thereof. The shell 30 is constituted by thermally adhering a first laminated film 31 which includes a first metal layer 313 and a first thermo-adhesive resin layer 315, a second laminated film 32 which includes a second metal layer 323 and a second thermo-adhesive resin layer 325 by thermally adhering the first thermo-adhesive resin layer 315 and the second thermo-adhesive resin layer 325. Moreover, the positive electrode side of the battery part 10 is electrically connected to the first metal layer 313 of the first laminated film 31, and the negative electrode side of the battery part 10 is electrically connected to the second metal layer 323 of the second laminated film 32.