SECONDARY BATTERY

According to the present disclosure, a secondary battery capable of inhibiting precipitation of metallic lithium is provided. The secondary battery disclosed herein includes a flat wound electrode body. A positive electrode starting end portion inside the electrode body has a first region extending along a flat portion of the electrode body. On the other hand, a negative electrode starting end portion inside the electrode body has a second region extending along the flat portion, a folded portion folded back from an end portion of the second region, and a third region extending from an end portion of the folded portion. In addition, the electrode body has an electrode starting end stacked portion in which the first region, the second region, and the third region overlap. According to such a configuration, it is possible to prevent a partial pressing failure from occurring and inhibit the precipitation of metallic lithium.