To provide a new flexible flat cable that has an increased current- carrying capacity under a permissible temperature range of a material by improving dissipation of heat.

On each side of a flexible base film 6, a plurality of flat parallelepiped conductors 2, 2... are positioned so as to be staggered viewed from its cross section at fixed intervals, the each flat parallelepiped conductor 2 laminated with a belt-like plastic film 3 having an adhesive to be integrated with the base film 6 so that each parallelepiped conductor 2 may be independent of adjacent ones. Accordingly, because the heat generated in a live wire is dissipated effectively with the surface area increase, the current-carrying capacity under the permissible temperature range of the material is increased largely.