A sealed battery with a film casing, comprising: a film casing covering a battery element; a first and a second electrode terminal (4A, 4B), wherein the first electrode terminal is on a positive electrode side and the second electrode terminal is on a negative electrode side of the battery element, wherein the first and the second electrode terminal (4A, 4B) are taken out from a sealing part of the film casing, said sealing part being formed by heat sealing; and a part of the first electrode terminal between a portion of the first electrode terminal positioned at the sealing part and a part of a portion of the first electrode terminal extending outward beyond the sealing part being covered by a first insulating resin layer, and a part of the second electrode terminal between a portion of the second electrode terminal positioned at the sealing part and a part of a portion of the second electrode terminal extending outward beyond the sealing part being covered by a second insulating resin layer; and an easy bending part having low bending strength as compared with other sections being formed at each of the insulating resin layers (6A, 6B) positioned at a part extending outward beyond the sealing part, or an easy bending part having low bending strength being formed on each of the electrode terminals (4A, 4B) covered by the insulating resin layers positioned at a part extending outward beyond the sealing part, wherein the region with low strength against bending is formed by a notched part (9A; 9B) or a void part, and wherein the notched part or the void part formed on the electrode terminal has a conductive sectional area which is adapted to function as a fuse in case of an excess current. a film casing covering a battery element; a first and a second electrode terminal (4A, 4B), wherein the first electrode terminal is on a positive electrode side and the second electrode terminal is on a negative electrode side of the battery element, wherein the first and the second electrode terminal (4A, 4B) are taken out from a sealing part of the film casing, said sealing part being formed by heat sealing; and a part of the first electrode terminal between a portion of the first electrode terminal positioned at the sealing part and a part of a portion of the first electrode terminal extending outward beyond the sealing part being covered by a first insulating resin layer, and a part of the second electrode terminal between a portion of the second electrode terminal positioned at the sealing part and a part of a portion of the second electrode terminal extending outward beyond the sealing part being covered by a second insulating resin layer; and an easy bending part having low bending strength as compared with other sections being formed at each of the insulating resin layers (6A, 6B) positioned at a part extending outward beyond the sealing part, or an easy bending part having low bending strength being formed on each of the electrode terminals (4A, 4B) covered by the insulating resin layers positioned at a part extending outward beyond the sealing part, wherein the region with low strength against bending is formed by a notched part (9A; 9B) or a void part, and wherein the notched part or the void part formed on the electrode terminal has a conductive sectional area which is adapted to function as a fuse in case of an excess current.