A first packaging material, a second packaging material, an electrode body having a positive electrode, a negative electrode, and a separator are provided. A packaging member is formed having an electrode body chamber. A first inner conducting portion allows conduction to a first metal foil and a second inner conducting portion allows conduction to a second metal foil. In the electrode body chamber, electrode body is conducted to a first inner conducting portion in the positive electrode and the electrode body is conducted to a second inner conducting portion in the negative electrode. At least one of the pair of the first metal foil and the positive electrode current collector of the positive electrode and the pair of the second metal foil and the negative electrode current collector of the negative electrode is made of the same metal.