A fuel-cell unit cell comprising: a membrane-electrode gas-diffusion-layer assembly (MEGA) plate including an MEGA and a resin frame (31, 32, 33) joined to a periphery of the MEGA; a first separator placed in contact with a first surface of the MEGA and also placed on a first-surface side of the resin frame (31, 32, 33); and a second separator placed in contact with a second surface of the MEGA and also placed on a second-surface side of the resin frame (31, 32, 33); wherein a gas manifold hole (62, 64, 72, 74) is formed in an outer edge portion of the resin frame (31, 32, 33), the fuel-cell unit cell further comprising: a gas-flow-path forming portion (34T; 34Ta; 34Tb) with a recessed-and-protruded shape, provided on the first surface of the resin frame (31, 32, 33), for forming gas flow paths between the gas manifold hole (62, 64, 72, 74) and the first surface of the MEGA; and a bonding portion for surrounding a periphery of the gas manifold hole (62, 64, 72, 74) to cut off gas circulation between the gas manifold hole (62, 64, 72, 74) and the second surface of the MEGA and for bonding the resin frame (31, 32, 33) and the second separator with each other, the bonding portion being formed on the second surface of the resin frame (31, 32, 33) so as to pass across a backside of the gas-flow-path forming portion (34T; 34Ta; 34Tb), characterized in that the bonding portion is a fusion bonding portion and, the fusion-bonding portion is formed from a first resin, and the gas-flow-path forming portion (34T; 34Ta; 34Tb) is formed from a second resin higher in melting point than the first resin. a membrane-electrode gas-diffusion-layer assembly (MEGA) plate including an MEGA and a resin frame (31, 32, 33) joined to a periphery of the MEGA; a first separator placed in contact with a first surface of the MEGA and also placed on a first-surface side of the resin frame (31, 32, 33); and a second separator placed in contact with a second surface of the MEGA and also placed on a second-surface side of the resin frame (31, 32, 33); wherein a gas manifold hole (62, 64, 72, 74) is formed in an outer edge portion of the resin frame (31, 32, 33), the fuel-cell unit cell further comprising: a gas-flow-path forming portion (34T; 34Ta; 34Tb) with a recessed-and-protruded shape, provided on the first surface of the resin frame (31, 32, 33), for forming gas flow paths between the gas manifold hole (62, 64, 72, 74) and the first surface of the MEGA; and a bonding portion for surrounding a periphery of the gas manifold hole (62, 64, 72, 74) to cut off gas circulation between the gas manifold hole (62, 64, 72, 74) and the second surface of the MEGA and for bonding the resin frame (31, 32, 33) and the second separator with each other, the bonding portion being formed on the second surface of the resin frame (31, 32, 33) so as to pass across a backside of the gas-flow-path forming portion (34T; 34Ta; 34Tb), characterized in that the bonding portion is a fusion bonding portion and, the fusion-bonding portion is formed from a first resin, and the gas-flow-path forming portion (34T; 34Ta; 34Tb) is formed from a second resin higher in melting point than the first resin. a gas-flow-path forming portion (34T; 34Ta; 34Tb) with a recessed-and-protruded shape, provided on the first surface of the resin frame (31, 32, 33), for forming gas flow paths between the gas manifold hole (62, 64, 72, 74) and the first surface of the MEGA; and a bonding portion for surrounding a periphery of the gas manifold hole (62, 64, 72, 74) to cut off gas circulation between the gas manifold hole (62, 64, 72, 74) and the second surface of the MEGA and for bonding the resin frame (31, 32, 33) and the second separator with each other, the bonding portion being formed on the second surface of the resin frame (31, 32, 33) so as to pass across a backside of the gas-flow-path forming portion (34T; 34Ta; 34Tb), characterized in that the bonding portion is a fusion bonding portion and, the fusion-bonding portion is formed from a first resin, and the gas-flow-path forming portion (34T; 34Ta; 34Tb) is formed from a second resin higher in melting point than the first resin.