To provide a separator for a fuel cell capable of controlling gas concentration fall at a downstream side of a gas flow channel.

The separator for a fuel cell, having gas flow channels 27, 28 with gas inlets 27a, 28a, and gas outlets 27b, 28b, placed on the same side of the separator, and equipped with a plurality of folded parts 27c, 28c, is provided with a bypass channel 32 that communicates with a folded part of the uppermost stream side and a folded part of the lowermost stream side. The separator 18 is arranged perpendicular to the direction of gravity.

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