NOVELTY - The fuel cell (10) includes several cell units (12) formed by stacking an electrolyte electrode assembly (14) and a metal separator (16) in stacking direction. The electrode assembly includes electrodes between which an electrolyte is arranged. A resin frame (28b) is formed integrally in outer circumference of electrode assembly. The connection channels are formed for connecting the coolant supply passages (34a) and coolant discharge passages (34b) with coolant flow field. Each connection channel has through-hole provided in separator and through-hole provided in frame.    USE - Fuel cell such as solid polymer electrolyte fuel cell mounted in vehicle.    ADVANTAGE - The size of relatively expensive metal separators is reduced and the width of fuel cell is reduced. No fluid passages are required in the metal separators. The metal separators can be formed into an outer shape having dimensions which correspond to the power generation area. Thus, reduction in size and weight of the metal separators can be achieved easily, and it becomes possible to reduce the production cost of metal separators. Accordingly, the metal separators can be manufactured efficiently, and thus it becomes possible to obtain the entire fuel cell economically, and the fuel cell can be installed more easily. The coolant can flow through the coolant flow field more uniformly and reliably, and it becomes possible to maintain the uniform humidity environment over the entire power generation area, and power generation can be performed efficiently.    DETAILED DESCRIPTION - The coolant flow field for allowing a coolant to flow along a separator surface is formed between the adjacent cell units. A reactant gas supply passage and a reactant gas discharge passage extend through one pair of opposite sides of the resin frame in the stacking direction as passages of a reactant gas. A pair of coolant supply passages and a pair of coolant discharge passages extend through the other pair of opposite sides of the resin frame in the stacking direction for allowing the coolant to flow through. The coolant supply passages are positioned adjacent to the reactant gas supply passage or the reactant gas discharge passage. The coolant discharge passages are positioned adjacent to the reactant gas discharge passage or the reactant gas supply passage.    DESCRIPTION OF DRAWING(S) - The drawing shows an exploded perspective view of the fuel cell. (Drawing includes non-English language text)    Fuel cell (10)    Cell unit (12)    Electrolyte electrode assembly (14)    Metal separator (16)    Resin frame (28b)    Coolant supply passage (34a)    Coolant discharge passage (34b)