A lithium secondary battery 10 is provided with an inner electrode body 1 comprising a positive electrode plate and a negative electrode plate respectively made up of at least one metal foil 6 wound or laminated; said inner electrode body being impregnated with a non-aqueous electrolyte, current collector members 5A and 5B for leading a current out of this inner electrode body 1, a battery case 11 with both ends left open; said battery case housing the inner electrode body 1, and two caps 13 provided with internal terminals 14A and 14B thereon; said caps being used to seal the inner electrode body 1 at both open ends of the battery 11. By adopting such a configuration that positive and negative external terminals are placed on one end of a battery collectively, protrusions of the battery are so reduced that the collective coupling of batteries becomes easier.