A gas flow passage-forming member (10) is disposed between a membrane electrode and gas diffusion layer assembly (12) and a separator (13) of a fuel cell, and the gas flow passage-forming member (10) is configured to form a gas flow passage (Ar). The gas flow passage-forming member (10) has a corrugated shape such that groove portions (31, 33) and ridge portions (32, 34) are provided on each of a front side and a back side of the gas flow passage-forming member (10). The groove portions (31) each serve as the gas flow passage (Ar). The gas flow passage-forming member (10) has communication holes (41) providing communication between the front side and the back side, and the communication holes (41) are provided in a region downstream of an upstream region (30A) in a gas flow direction. The upstream region (30A) is a non-communication region with no communication hole (41).