A fuel cell comprising: a plurality of cells respectively including a membrane electrode assembly placed between an anode separator and a cathode separator, wherein the membrane electrode assembly includes: an electrolyte membrane; a first electrode joined to one surface from among two opposite surfaces of the electrolyte membrane; and a second electrode joined to another surface of the electrolyte membrane, the other surface being different from the one surface; wherein: a first peripheral section which is at least part of periphery of the first electrode is located on an inner side along a planar direction of the first electrode compared to respective peripheries of the electrolyte membrane and the second electrode, a periphery of the electrolyte membrane is kept in a deformed state toward the side of the first electrode by pressing the second electrode against the electrolyte membrane by means of a plate-like member that is located on an outer side along the planar direction with respect to the first peripheral section of the first electrode or the anode separator that is protruded toward the side of the second electrode, the fuel cell further comprising: a stress suppressing structure configured to suppress concentration of stress on a location along the first peripheral section in the electrolyte membrane, the stress suppressing structure placed in a contact or non-contact state with the electrolyte membrane, the concentration of stress occurring by the periphery of the electrolyte membrane being deformed toward the first electrode side, wherein at least part of the stress suppressing structure is configured such that an elastic member having a smaller transverse elasticity modulus compared to the electrolyte membrane is pressure welded to a first electrode-side of the electrolyte membrane and on an outer side along the planar direction compared to the first peripheral section with a vacant space where the elastic member can deform from the initial position toward the first electrode. a plurality of cells respectively including a membrane electrode assembly placed between an anode separator and a cathode separator, wherein the membrane electrode assembly includes: an electrolyte membrane; a first electrode joined to one surface from among two opposite surfaces of the electrolyte membrane; and a second electrode joined to another surface of the electrolyte membrane, the other surface being different from the one surface; an electrolyte membrane; a first electrode joined to one surface from among two opposite surfaces of the electrolyte membrane; and a second electrode joined to another surface of the electrolyte membrane, the other surface being different from the one surface; wherein: a first peripheral section which is at least part of periphery of the first electrode is located on an inner side along a planar direction of the first electrode compared to respective peripheries of the electrolyte membrane and the second electrode, a periphery of the electrolyte membrane is kept in a deformed state toward the side of the first electrode by pressing the second electrode against the electrolyte membrane by means of a plate-like member that is located on an outer side along the planar direction with respect to the first peripheral section of the first electrode or the anode separator that is protruded toward the side of the second electrode, a first peripheral section which is at least part of periphery of the first electrode is located on an inner side along a planar direction of the first electrode compared to respective peripheries of the electrolyte membrane and the second electrode, a periphery of the electrolyte membrane is kept in a deformed state toward the side of the first electrode by pressing the second electrode against the electrolyte membrane by means of a plate-like member that is located on an outer side along the planar direction with respect to the first peripheral section of the first electrode or the anode separator that is protruded toward the side of the second electrode, the fuel cell further comprising: a stress suppressing structure configured to suppress concentration of stress on a location along the first peripheral section in the electrolyte membrane, the stress suppressing structure placed in a contact or non-contact state with the electrolyte membrane, the concentration of stress occurring by the periphery of the electrolyte membrane being deformed toward the first electrode side, wherein at least part of the stress suppressing structure is configured such that an elastic member having a smaller transverse elasticity modulus compared to the electrolyte membrane is pressure welded to a first electrode-side of the electrolyte membrane and on an outer side along the planar direction compared to the first peripheral section with a vacant space where the elastic member can deform from the initial position toward the first electrode.