Bonding dies for producing a fuel cell that can suppress floating of a portion of a resin frame bonded to a membrane electrode assembly include first and second dies facing and contacting respective first and second separators. The first die includes a central receiving portion and an outer periphery receiving portion. The second die includes an inner die that pressurizes a central region of the second separator, and an outer die formed to surround the inner die to thermally compress a peripheral region of the second separator. The inner die extends from a portion corresponding to the central region along an open edge in the resin frame, up to a region closer to an outer periphery side of the electrode assembly than a portion of the resin frame bonded to the membrane electrode assembly, so as to pressurize the resin frame via the other separator.