Abstract: A flat cable having high performances in current-carrying, insulation, and safety is provided. The flat cable 1, comprises: a pair of conductive thin plates 2 of strip-shape arranged in parallel; an insulating layer 3 covering the conductive thin plates 3; and a sheath protective layer 4 covering the conductive thin plates 2 covered with the insulating layer 3. The conductive thin plate 2 has a thickness of 0.6 mm or less and a cross-sectional width of 4 mm or more. the insulating layer 3 has a thickness of 0.25 mm or more, the sheath protective layer 4 has a thickness of 0.25 mm or more, and the flat cable has a total thickness of 2 mm or less and a cross-sectional total width of 20 mm or more.