To provide a battery for use in a hybrid car, etc., capable of enhancing the welding quality of a bus bar connection part and reducing the electric resistance of a connection part.

In this battery wherein an electrode laminated body 2 laminated with positive and negative electrode materials with a separator being sandwiched, an armor can 1 for accommodating the electrode laminated body 2 and a charge collector 3 connected to the negative electrode material and fixed inside the armor can 1 are provided and the charge collector 3 also serves as a battery electrode, the charge collector 3 comprises a collector part 3a that is accommodated inside the armor can 1 and connected to the negative electrode material and an electrode part 3b that passes through the armor can 1 and is exposed outside the armor can 1. As a result, a bus bar 4 can be welded directly to the electrode part 3b exposed outside the armor can 1.