A connection structure (10) is provided for connecting electrical storage element groups (12), each of which is formed by connecting electrical storage elements (13) having electrode terminals (14) in series, side by side. The electrical storage element groups (12) are connected electrically by connecting a connecting member (20) for connecting adjacent electrical storage element groups (12) to a first electrode terminal (16A) and a second electrode terminal (16B). The first electrode terminal (16A) is arranged on one end part of one electrical storage element group (12) and on the side of the adjacent other electrical storage element group (12) and the second electrode terminal (16B) is the electrode terminal (14) arranged on another end part of the other electrical storage element group (12B) opposite to the one end part of the one electrical storage element group (12A) and on the side of the adjacent one electrical storage element group (12A).