The flexible wiring board has a first wiring film and a second wiring film. Because the first wiring film has a larger thickness than the second wiring film, the sectional area and electrical resistance of the first wiring film can be enlarged because of the larger film thickness even in a case where the first and second wiring films have almost the same width. Therefore, a high current can flow through the first wiring film, although the wiring film has a small width. As a result, a high density of the flexible wiring board can be easily achieved.