NOVELTY - A fuel-cell stack (10) comprises a box-like casing (11) comprising a pair of end plates (20a, 20b), pairs of side plates (1a-1d), hinge plates (1aa, 1ab, 1ba, 1bc, 1ca, 1cc, 1da, 1dc), and linking pins (64a, 64b); and a pair of spot-welding electrodes having an end face formed with a concave. The side plate and the hinge plate are made of stainless steel.    USE - Used as, e.g. solid-polymer type fuel-cell stack used as a power source for electric vehicles.    ADVANTAGE - An increased area of the melted portion allows enhancement in welding strength and reduction in junctions of spot welding. Sheet separation is reduced between the hinge plate and the side plate, allowing enhancement in strength to shear fatigue due to repeated load.    DETAILED DESCRIPTION - A fuel-cell stack comprises a unit cell (12) comprising an electrolyte/electrode structure having electrodes arranged on both sides of an electrolyte, the electrolyte/electrode structure being held by metal separators; a box-like casing that accommodates a laminate (14) having the unit cells laminated, and comprising a pair of end plates arranged at both ends of the laminate in a laminating direction, pairs of side plates arranged at sides of the laminate, the pairs of side plates being formed of a metal plate having a first thickness, hinge plates welded to both ends of the pairs of the side plates by spot welding, the hinge plates being formed of a metal plate having a second thickness greater than the first thickness, and linking pins that link the pair of end plates and hinge plates; and a pair of spot-welding electrodes having an end face formed with a concave, the hinge plate and the side plate being welded by energization with the at least one of the pair of spot-welding electrodes being arranged on a side of the hinge plate and with the hinge plate and the side plate being in press contact by the pair of spot-welding electrodes. The side plate and the hinge plate are made of stainless steel. An INDEPENDENT CLAIM is also included for a method of manufacturing a fuel-cell stack.    DESCRIPTION OF DRAWING(S) - The figure shows a perspective exploded view of the fuel-cell stack.    Side plates (1a-1d)    Hinge plates (1aa, 1ab, 1ba, 1bc, 1ca, 1cc, 1da, 1dc)    Fuel-cell stack (10)    Casing (11)    Unit cell (12)    Laminate (14)    End plates (20a, 20b)    Linking pins (64a, 64b)