A fuel cell, comprising: a cell laminate body, which is formed by laminating a substantially rectangular separator and a membrane electrode assembly equipped with substantially rectangular anode and cathode electrode layers located on opposite surfaces of a substantially rectangular electrolyte membrane, and which comprises an anode flow channel, a cathode flow channel, and a cooling fluid channel inside; and external manifolds (41, 42, 43, 44) that are provided outside of the cell laminate body for supplying or discharging the respective fluids of the anode gas, the cathode gas, and the cooling fluid, with respect to the cell laminate body; wherein in the cell laminate body, at least the anode flow channel and the cathode flow channel are configured from a plurality of linear ribs; the aspect ratio R (L/W), which is the ratio of the length of the electrode layer along the anode flow channel or the cathode flow channel direction and the width of the electrode layer in the width direction that is perpendicular to the anode flow channel or the cathode flow channel direction, is less than 1; two or more flow channel openings (9, 11) are provided to each of the two ends of the anode flow channel and the cathode flow channel; and the flow channel openings (9, 11) are laminated so as to configure two or more fluid-supplying internal manifolds (22a, 24a) and two or more fluid-discharging internal manifolds (22b, 24b) for the anode gas and the cathode gas; the external manifold for the anode gas and the external manifold for the cathode gas include fluid-supplying external manifolds (42a, 44a), which connect to the fluid-supplying internal manifolds (22a, 24a) via a supply-side communicating portion, and fluid-discharging external manifolds (42b, 44b), which connect to the fluid-discharging internal manifolds (22b, 24b) via a discharge-side communicating portion; characterized in that the respective fluid-supplying and fluid-discharging external manifolds (42a, 44a; 42b, 44b) are positioned approximately parallel to each other, extending in the width direction of the cell laminate body, and the supply-side communicating portion and the discharge-side communicating portion comprise a first auxiliary manifold (51, 51a, 51b), which is connected to the internal manifold (22, 24), and a second auxiliary manifold (52, 52a, 52b), which is connected to the external manifold (42, 44) and comprises a center line that intersects with the center line of the external manifold (42, 44) and the center line of the first auxiliary manifold (51, 51a, 51b), with respect to at least one fluid of the anode gas or the cathode gas. a cell laminate body, which is formed by laminating a substantially rectangular separator and a membrane electrode assembly equipped with substantially rectangular anode and cathode electrode layers located on opposite surfaces of a substantially rectangular electrolyte membrane, and which comprises an anode flow channel, a cathode flow channel, and a cooling fluid channel inside; and external manifolds (41, 42, 43, 44) that are provided outside of the cell laminate body for supplying or discharging the respective fluids of the anode gas, the cathode gas, and the cooling fluid, with respect to the cell laminate body; wherein in the cell laminate body, at least the anode flow channel and the cathode flow channel are configured from a plurality of linear ribs; the aspect ratio R (L/W), which is the ratio of the length of the electrode layer along the anode flow channel or the cathode flow channel direction and the width of the electrode layer in the width direction that is perpendicular to the anode flow channel or the cathode flow channel direction, is less than 1; two or more flow channel openings (9, 11) are provided to each of the two ends of the anode flow channel and the cathode flow channel; and the flow channel openings (9, 11) are laminated so as to configure two or more fluid-supplying internal manifolds (22a, 24a) and two or more fluid-discharging internal manifolds (22b, 24b) for the anode gas and the cathode gas; the external manifold for the anode gas and the external manifold for the cathode gas include fluid-supplying external manifolds (42a, 44a), which connect to the fluid-supplying internal manifolds (22a, 24a) via a supply-side communicating portion, and fluid-discharging external manifolds (42b, 44b), which connect to the fluid-discharging internal manifolds (22b, 24b) via a discharge-side communicating portion; characterized in that the respective fluid-supplying and fluid-discharging external manifolds (42a, 44a; 42b, 44b) are positioned approximately parallel to each other, extending in the width direction of the cell laminate body, and the supply-side communicating portion and the discharge-side communicating portion comprise a first auxiliary manifold (51, 51a, 51b), which is connected to the internal manifold (22, 24), and a second auxiliary manifold (52, 52a, 52b), which is connected to the external manifold (42, 44) and comprises a center line that intersects with the center line of the external manifold (42, 44) and the center line of the first auxiliary manifold (51, 51a, 51b), with respect to at least one fluid of the anode gas or the cathode gas.