A flat cable includes at least one cable portion and at least one rib portion. The at least one cable portion has a plurality of conductor wires arranged in parallel at predetermined intervals on a plane, and a coating portion that collectively covers the plurality of conductor wires arranged in parallel. The coating portion is made of an insulating resin. The at least one rib portion is provided in parallel with the cable portion on the plane. bus bar is to be fixed to the at least one rib portion and the at least one rib portion is made of only the same resin as the coating portion. A body including the at least one cable portion and the at least one rib portion is substantially bilaterally symmetrical in a cross-sectional structure of the body.