SEALED BATTERY

PROBLEM TO BE SOLVED: To provide a sealed battery without causing a problem such as cracking or breaking of an electrode in a rolled part or a folded part, or separation or break of a battery active material from the surface of a collector, in a battery composed by disposing a positive electrode and a negative electrode through a separator by making them face each other and by rolling or folding them. SOLUTION: In relation to a rectangular battery composed of a positive electrode 2 and a negative electrode 3 facing each other through a separator 4 and by rolling or folding them, this sealed battery is so structured that at least one of the positive electrode and the negative electrode has a coated layer on a conductive substrate, the thickness of the coat layer 12 inside at least a part of a curved surface part 5 or the folded part is smaller than that of a part other than the curved surface part or the folded part.