A secondary battery including: spirally wound electrode body in which positive electrode and negative electrode are laminated via separator and spirally wound, wherein the positive electrode includes an inner circumference side positive electrode active material layer and an outer circumference side positive electrode active material layer while including a single side active material layer formation region, the ratio A/(A+B) of an area density A of the inner circumference side positive electrode active material layer and an area density B of the outer circumference side positive electrode active material layer, an inner diameter C of the coil opening portion, and the ratio D/E of a thickness D of the positive electrode and a thickness E of the positive electrode collector satisfy the relationship expressed in Formula 1, and a length F of the single side active material layer formation region satisfies the relationship expressed in Formula 2.