NOVELTY - The method involves preparing (S12) an electrode body (90). A liquid filling unit (102) containing thermosetting resin is coated (S14) on a surface (89) of a gas diffusion layer (66) arranged among outer peripheral parts of a membrane electrode assembly (80). Packing fraction (121) of the filling unit put between a sealing unit (69) and the assembly is hardened (S17). Separators (62, 64) are attached (S18) to sides of the electrode body such that an exposed part (122) of the filling unit is hardened, while arranging the separators on a top surface of the layer of the sealing unit.    USE - Method for manufacturing a fuel cell i.e. polymer electrolyte fuel cell, by laminating a single cell in various numbers.    ADVANTAGE - The method enables attaching the separators to the sides of the electrode body such that the exposed part of the liquid filling unit can be hardened, while arranging the separators on the top surface of the gas diffusion layer of the sealing unit, so that the electrode body with a seal can be easily conveyed without hardening the exposed part and excess pressure added to a compatible MEA part can be reduced, thus reducing buckling deformation of the membrane electrode assembly, and preventing the membrane electrode assembly from damage.    DESCRIPTION OF DRAWING(S) - The drawing shows a flow diagram illustrating a manufacturing method of a fuel cell.'(Drawing includes non-English language text)'    Step for preparing electrode body (S12)    Step for coating liquid filling unit containing thermosetting resin on surface of gas diffusion layer (S14)    Step for hardening packing fraction of liquid filling unit put between sealing unit and membrane electrode assembly (S17)    Step for attaching separators to both sides of electrode body (S18)    Separators (62, 64)    Gas diffusion layer (66)    Sealing unit (69)    Membrane electrode assembly (80)    Surface of gas diffusion layer (89)    Electrode body (90)    Liquid filling unit (102)    Packing fraction (121)    Exposed part (122)