Fuel cell

A fuel cell comprising:

• a frame body having a membrane electrode assembly;
• a pair of separators configured to sandwich the frame body from two surface sides;
• a plurality of projections arranged at given intervals on each of the two surface sides of the frame body;
• a gas flow path for a hydrogen-containing gas formed on one surface side of the frame body;
• a gas flow path for an oxygen-containing gas formed on the other surface side of the frame body;
• and
• a plurality of diffuser units, which are regions outside a region provided with the membrane electrode assembly, and which are regions where the gas flow path for the hydrogen-containing gas and the gas flow path for the oxygen-containing gas are overlapped across the frame body, wherein
• each projection has a contact surface which is formed on one of the frame body or a separator, the contact surface being in contact with the other of the frame body or the separator, and
• the projections on the one surface side of the frame body and the projections on the other surface side thereof are arranged on the diffuser units asymmetrically with respect to the frame body in a stacking direction of the fuel cell such that when differential pressures are generated between pressure of the oxygen-containing gas and pressure of the hydrogen-containing gas, positions where stresses are generated and distributions of the stresses in the frame body are displaced.