NOVELTY - A printed circuit board (1) comprises a bent portion is provided at a boundary between the first region and the second region, and the third region is provided so that at least part of the first extraction portion and at least part of the second extraction portion on the third region are not overlapped with the second region when the first and second regions are bent at the bent portion with the one surface as an inner side.    USE - A printed circuit board for a fuel cell (claimed), preferably direct methanol fuel cell.    ADVANTAGE - The board has improved reliability of its connection to an external circuit thus avoiding generation of positional shift.    DETAILED DESCRIPTION - A printed circuit board (1) comprises:    (1) an insulating layer having one surface and another surface both including first and second regions that are adjacent to each other and a third region that is adjacent to the first region on the one surface;    (2) a first conductor layer (3) formed on the first region of the insulating layer;    (3) a second conductor layer formed on the second region of the insulating layer;    (4) a first extraction portion formed to extend from the first conductor layer to the third region of the insulating layer;    (5) a second extraction portion formed to extend from the second conductor layer to the third region of the insulating layer; and    (6) a bent portion is provided at a boundary between the first region and the second region, and the third region is provided so that at least part of the first extraction portion and at least part of the second extraction portion on the third region are not overlapped with the second region when the first and second regions are bent at the bent portion with the one surface as an inner side.    The board further comprises a metal layer that has electrical conductivity and acid resistance, and is formed to cover the first and second conductor layers and the first and second extraction portions. An INDEPENDENT CLAIM is included for a fuel cell.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic view of a flexible printed circuit board.    Printed circuit board (1)    Base insulating layer (2)    First insulating portion (2a)    Conductor layer (3)    Cover insulating layer (6)