A film covered electric device comprising: an electric device element to which a positive electrode lead and a negative electrode lead are connected, said electric device being selected from the group consisting of chemical cell elements and capacitor elements and having positive electrodes and negative electrodes that are laminated in a thickness direction; and a casing film made up of two laminate films having at least a metal layer and a thermally sealable resin layer laminated to each other, said casing film sandwiching and wrapping said electric device element from both sides in the thickness direction with said thermally sealable resin layer being placed inside, and being thermally sealed in the thickness direction around said electric device element to seal said electric device element with said leads extended therefrom, wherein each of said laminate films of said casing film has a cup area for receiving said electric device element therein, whereby a thermally sealed area formed by thermally sealing said casing film is positioned between both surfaces of said electric device element, said both surfaces being positioned in the thickness direction, at least one of the sides of said casing film, from which said leads are not extended, is formed with a close contact zone in which said casing films directly opposing without intervention of said electric device element are in close contact with each other without being thermally sealed, between said thermally sealed area and said electric device element, and L2≥(1/2)L1 is satisfied, where L1 is a distance from one end to the other end of an inner edge of said thermally sealed area and L2 is the length of said close contact zone in a direction along the side formed with said close contact zone. an electric device element to which a positive electrode lead and a negative electrode lead are connected, said electric device being selected from the group consisting of chemical cell elements and capacitor elements and having positive electrodes and negative electrodes that are laminated in a thickness direction; and a casing film made up of two laminate films having at least a metal layer and a thermally sealable resin layer laminated to each other, said casing film sandwiching and wrapping said electric device element from both sides in the thickness direction with said thermally sealable resin layer being placed inside, and being thermally sealed in the thickness direction around said electric device element to seal said electric device element with said leads extended therefrom, wherein each of said laminate films of said casing film has a cup area for receiving said electric device element therein, whereby a thermally sealed area formed by thermally sealing said casing film is positioned between both surfaces of said electric device element, said both surfaces being positioned in the thickness direction, at least one of the sides of said casing film, from which said leads are not extended, is formed with a close contact zone in which said casing films directly opposing without intervention of said electric device element are in close contact with each other without being thermally sealed, between said thermally sealed area and said electric device element, and L2≥(1/2)L1 is satisfied, where L1 is a distance from one end to the other end of an inner edge of said thermally sealed area and L2 is the length of said close contact zone in a direction along the side formed with said close contact zone.