A bus bar, which is used with batteries wherein the positive terminal and the negative terminal are each formed from a different metal, and which has excellent mechanical strength and can suppress electrical resistance while preventing galvanic corrosion. The bus bar is bonded in one piece by metallically bonding: a cathode connector that is formed from the same metal as the positive terminal of a battery cell, and that can connect to the positive terminal; and an anode connector that is formed from the same metal as the negative terminal of the battery cell, and that can connect to the negative terminal.