NOVELTY - A film case type electricity storage device comprises airtight film case storing electrode group (6) obtained by laminating or laminating and winding first electrode sheet (1), second electrode sheet (2) and third sheet, and bar-like reinforcing member provided along the periphery of electrode group. The electrode group is winding-type electrode group obtained by laminating and winding first/second/third sheet. The bar-like reinforcing member is provided along at least one direction of the peripheries at a longer diameter direction of the ellipse shaped cross-section.    USE - As film case type electricity storage device in a secondary battery (claimed). The electricity storage device includes a condenser, a capacitor and a battery useful in application such as a power source for mobile electronic device, as a power source for an automobile or as power source for mobile phone or notebook-type personal computer.    ADVANTAGE - The film-case-type electricity storage device is capable of being produced easily and because of having higher mechanical strength as compared with the conventional ones, without impairing the advantage of light weight by using the film case as the external packaging, the deformation of the electricity storage device can be suppressed and the short-circuit can be prevented. The device can endure a long period of service and hence it is industrially extremely promising.    DETAILED DESCRIPTION - A film case type electricity storage device comprises an airtight film case storing an electrode group (6) obtained by, laminating or laminating and winding a first electrode sheet (1), a second electrode sheet (2) and a third sheet, and a bar-like reinforcing member provided along the periphery of the electrode group. The electrode group is a winding-type electrode group obtained by laminating and winding the first electrode sheet, the second electrode sheet, and the third sheet. The bar-like reinforcing member is provided along at least one direction of the peripheries at a longer diameter direction of the ellipse shaped cross-section. The film case is made of a metal laminated resin film. The first electrode sheet configures a positive electrode, the second electrode sheet configures a negative electrode, and a non-aqueous-type electrolytic solution is contained. The non-aqueous-type electrolytic solution comprises lithium ions.    DESCRIPTION OF DRAWING(S) - The figure shows schematic view illustrating a configuration of the electrode group to be used in the film-case-type electricity storage device.    First electrode sheet (1)    Second electrode sheet (2)    Separators (3, 4)    Electrode tab of first electrode sheet (5a)    Electrode tab of second electrode sheet (5b)    Electrode group (6)