The purpose of the present invention is to provide a secondary cell in which a decrease in energy density is inhibited. In order to achieve this purpose, this secondary cell has a positive electrode in which a positive electrode active material layer is provided on a positive electrode collector, and a negative electrode in which a negative electrode active material layer is provided on a negative electrode collector; the positive electrode active material layer and the negative electrode active material layer are laminated so as to face each other with a separator interposed therebetween; the negative electrode active material layer has a greater area than the positive electrode active material layer; and a thin section is provided in at least a part of the negative electrode active material layer at a location where the negative electrode active material layer does not face the positive electrode active material layer.