Sealed battery

A sealed battery comprising:

• an electricity generating element;
• a container member that has a bottomed rectangular columnar shape and that houses the electricity generating element;
• a rectangular lid member that closes an opening of the container member and that has a through hole;
• an external terminal member protruded outward from the lid member;
• a current-collecting terminal member whose first end is connected to the electricity generating element within the container member and whose second end is tubular and is inserted through the through hole and extends outward from the lid member;
• a gasket that, at an inner side of the lid member, electrically insulates the lid member and the current-collecting terminal member from each other;
• and
• a platy connection member that, at an outer side of the lid member, connects the current-collecting terminal member and the external terminal member to each other,
• wherein the platy connection member has an insertion hole through which the second end of the current-collecting terminal member is inserted, and the platy connection member and the current-collecting terminal member are connected by swaging the second end of the current-collecting terminal member to the insertion hole,
• the lid member has a lid-side protruded portion that compresses the gasket, in a gasket-side surface of the lid member,
• the current-collecting terminal member has, at a position facing the lid-side protruded portion, a terminal-side protruded portion that compresses the gasket, in a gasket-side surface of the current-collecting terminal member, and
• a gasket-side area of the lid-side protruded portion, a gasket-side area of the terminal-side protruded portion, and an area of a surface of the current-collecting terminal member which faces and contacts the gasket, except the terminal-side protruded portion, are different in size from each other.