Fuel cell

A fuel cell comprising:

• a membrane electrode assembly and separators that are stacked, the membrane electrode assembly including an electrolyte membrane and a pair of electrodes sandwiching the electrolyte membrane therebetween, the membrane electrode assembly being provided with a resin frame member at an outer peripheral portion of the membrane electrode assembly,
• wherein the separator facing one of the electrodes includes a fuel gas channel, a fuel gas manifold, and a fuel gas buffer, the fuel gas channel allowing a fuel gas to be supplied along an electrode surface, the fuel gas manifold allowing the fuel gas to flow in a stacking direction in which the membrane electrode assembly and the separators are stacked, the fuel gas buffer connecting the fuel gas channel and the fuel gas manifold to each other,
• wherein the separator facing the other of the electrodes includes an oxidant gas channel, an oxidant gas manifold, and an oxidant gas buffer, the oxidant gas channel allowing an oxidant gas to be supplied along an electrode surface, the oxidant gas manifold allowing the oxidant gas to flow in the stacking direction, the oxidant gas buffer connecting the oxidant gas channel and the oxidant gas manifold to each other,
• wherein the fuel gas buffer includes a first fuel gas buffer region and a second fuel gas buffer region, the second fuel gas buffer region being more deeply grooved than the first fuel gas buffer region in the stacking direction,
• wherein the oxidant gas buffer includes a first oxidant gas buffer region and a second oxidant gas buffer region, the second oxidant gas buffer region being more deeply grooved than the first oxidant gas buffer region in the stacking direction and being deeply grooved in a direction opposite to the second fuel gas buffer region,
• wherein the second fuel gas buffer region and the second oxidant gas buffer region are arranged such that a position of the second fuel gas buffer region in plan view and a position of the second oxidant gas buffer region in plan view are shifted from each other as seen from the stacking direction, and
• wherein the resin frame member includes a fuel gas recess and an oxidant gas recess, the fuel gas recess overlapping the second fuel gas buffer region in the stacking direction, the oxidant gas recess overlapping the second oxidant gas buffer region in the stacking direction.