To prevent recovering force due to bending and prevent separation of conductive patterns at connecting parts.

On a flexible printed board, connecting parts 2a to 2i are provided on which patterns for connecting with another printed board or the like non-parallel to a folding line at a flection. On the connecting part 2i nearest to the folding line, a conductor exposing surface is formed and limited by a cover lay whose opening is smaller than the pattern of conductor. On the other connecting parts 2a to 2h, a conductor exposing surface is formed but not limited by a cover lay whose opening is larger than the pattern of conductor. Since the conductor exposing surface is limited by the cover lay at the connecting part 2i near to the folding line, the recovering force due to bending of the flexible printed board 1 is prevented.