Patent ID: 7470483

Claim:
A gas diffusion layer for a fuel cell electrode, said gas diffusion layer comprising: a gas diffusion layer which has a water repellent layer for contacting with a catalyst layer of said electrode, wherein: a base material of said gas diffusion layer is made of an electron conductive carbon fiber woven fabric, comprising a weave of a warp comprising electron conductive carbon fiber and a weft comprising electron conductive carbon fiber, and an opening is formed adjacent crossing points of said warp and said weft, wherein: the relationship about 1/1500≦(10/W−Y)(10/Z−X)/XY≦about 1/5 is satisfied where said carbon fiber woven fabric has a warp density of Z threads/cm, a weft density of W threads/cm, a warp thickness of X mm and a weft thickness of Y mm.