Fuel cell separator member and fuel cell stack

A fuel cell stack comprising power generation cells each including a fuel cell separator member, a load in a stacking direction of the power generation cells being applied to the fuel cell stack in a state where a plurality of the power generation cells are stacked together,

• wherein the fuel cell separator member comprises:
• a metal separator forming the power generation cell;
• and
• a load receiver provided for the metal separator in a manner that the load receiver protrudes outward from an outer peripheral portion of the metal separator,
• a metal bead and a rib are formed integrally with and protruded from one surface of the metal separator, the metal bead extending along the outer peripheral portion of the metal separator and being configured to prevent leakage of a reactant gas through a position between a membrane electrode assembly and the metal separator, the rib extending in a line pattern along the metal bead between the load receiver and the metal bead;
• the rib includes;
• a rib body positioned at a central portion of the rib in a direction in which the rib extends;
• and
• two retracted portions positioned at both ends of the rib in the direction in which the rib extends, and
• the protruding height of each of the two retracted portions is smaller than a protruding height of the rib body.