A busbar structure includes an electrode connection portion that is made of conductive metal and includes a terminal portion and an inter-battery connection portion that has an extended body portion extending from the electrode connection portion and at least one side edge portion of a pair of side edge portions extending from both ends of the extended body portion in a width direction perpendicular to an extending direction of the extended body portion. The at least one side edge portion of the pair of side edge portions is folded onto the extended body portion.