NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

A non-aqueous electrolyte secondary battery in which a potential of a metal layer in an exterior body is kept noble, and corrosion can be suppressed, including: a power generation element wherein a positive electrode and a negative electrode are opposed to each other with a separator interposed therebetween, and the negative electrode is disposed on an outer side than the positive electrode; and an exterior body which covers the power generation element, and has a metal layer and a resin layer which covers both surfaces of the metal layer, and an average thickness t of a first part of the exterior body which covers upper and lower surfaces of the power generation element in a lamination direction of the power generation element and an average thickness t of a second part of the exterior body which covers side surfaces of the power generation element satisfy a relationship of t/t