A flexible printed circuit includes a plurality of conductive paths to which connection protruding portions of connection protruding pieces protruding from conductive members to be connected to electrode terminals of power storage elements are to be connected. The flexible printed circuit includes a plurality of inlet openings that are larger in size than the external shapes of the connection protruding portions and into which the connection protruding portions can be inserted with a gap being formed around each protruding portion, and a plurality of entrance openings that are provided corresponding to the inlet openings, have a configuration in which the protruding portions can be moved thereinto from the inlet openings, and extend in the form narrower than the inlet openings. Each of the conductive paths includes a land that is located at an edge portion of the entrance opening and to which the connection protruding portion is to be connected.