A non-aqueous electrolyte secondary battery includes an external electrode terminal, a current collecting tab, a lead, and first and second insulating members. The lead has a hollow portion, electrically connecting the external electrode terminal and the diaphragm. The diaphragm is placed to cover the hollow portion and allow the diaphragm to deform toward the hollow portion. The first insulating member is interposed between the sealing plate and the lead. The second insulating member is interposed between the diaphragm and the current collecting tab. Side walls of the first insulating member and side walls of the second insulating member are coupled to each other. The battery is configured such that the diaphragm deforms toward the outside of the battery when a gas pressure increases in the battery, thereby breaking an electric connection between the external electrode terminal and an electrode assembly of the battery.