To enhance welding strength and reliability by using a collector laminated with materials having different electric resistances and by concentrating heat when welding in the case of joining the collector to an electrode group by resistance welding.

This battery is provided with a positive electrode plate 1, a negative electrode plate 2 and a separator 5. The battery is provided with a electrode group wherein portions 3 and 4 not having a mixture layer that contains an active material resides in at least one end of the positive electrode plate 1 and the negative electrode plate 2 and the portions 3 and 4 not having the mixture layer of the positive electrode plate 1 and the negative electrode plate 2 are aligned in one direction, respectively. The battery is also provided with a collector laminated with materials having different electric resistances. A layer of a material having a large electric resistance in the collector is welded with the portions 3 and 4 having no mixture layer of the electrode plates of the electrode groups.