Cylindrical battery

A cylindrical battery comprising:

• an electrode body;
• an electrolyte solution;
• a tubular exterior can that has a bottom and that accommodates the electrode body and the electrolyte solution;
• and a sealing body that is crimped on an opening portion of the exterior can,
• wherein the sealing body includes a current interrupt mechanism in which a valve member and an internal terminal plate are joined to each other with an insulating plate that includes a circular hollow portion interposed therebetween,
• wherein the internal terminal plate is joined to a lead that extends from the electrode body,
• wherein the internal terminal plate includes a thin portion that has a circular shape or a C-shape,
• wherein the hollow portion and the thin portion are concentric with each other when viewed from a direction perpendicular to the internal terminal plate,
• wherein D1/D2 is no less than 0.56 and no more than 1 where D1 is a diameter of the thin portion, and D2 is a diameter of the hollow portion, and
• wherein the valve member is exposed to an outside of the battery.