Fuel cell, fuel cell stack, and method for manufacturing fuel cell

A method for manufacturing a fuel cell, comprising the steps of:

• arranging a subassembly in a cavity of a mold, the sub-assembly including:
• a membrane electrode assembly having an electrolyte membrane and a pair of electrodes arranged on both sides of the electrolyte membrane in a thickness direction;
• a pair of frames having a frame shape and holding an outer periphery portion of the electrolyte membrane;
• a pair of gas diffusion layers arranged inside the pair of frames and on both sides of the membrane electrode assembly in the thickness direction;
• and
• a first cross-linking adhesive member formed of uncross-linked rubber, which includes a membrane accommodating portion having an indented shape for accommodating an outer periphery portion of the electrolyte membrane and a first intermediate portion interposed between the pair of frames;
• and
• integrating the first cross-linking adhesive member, the outer periphery portion of the electrolyte membrane, and the pair of frames through cross-linking adhesion, in which a gasket raw material is poured in the cavity to form a gasket covering at least a part of the pair of frames and the uncross-linked first cross-linking adhesive member is cross-linked.