A fuel cell module comprising: an electrode membrane assembly which includes: an electrode portion including a polymer electrolyte membrane, an anode electrode formed on a first surface of the polymer electrolyte membrane, and a cathode electrode formed on a second surface of the polymer electrolyte membrane; and a pair of gas diffusion layers (13A, 13B), one of which is in contact with an anode surface of the electrode portion at which the anode electrode is disposed and another of which is in contact with a cathode surface of the electrode portion at which the cathode electrode is disposed; and a pair of separators (3, 4) which sandwiches the electrode membrane assembly from respective the anode surface and the cathode surface, wherein: the electrode membrane assembly and each of the pair of separators (3, 4) are adhered to each other by a resin portion made of a resin which at least partially contains fibers, and at least a part of each of the pair of gas diffusion layers (13A, 13B) is impregnated with the resin, each of the pair of separators (3, 4) includes: a flow passage groove (8, 9) configured to supply and discharge one of a fuel gas and an oxidizing agent gas to and from the electrode portion; a pair of connecting grooves (10, 11) which are connected to a supply end and a discharge end of the flow passage groove (8, 9), respectively; and a pair of manifolds (6, 7) which are connected to the flow passage groove (8, 9) through the pair of connecting grooves (10, 11), respectively, and a plurality of different kinds of resins are stacked onto each other at parts of the resin portion which are exposed to the connecting grooves (10, 11). an electrode membrane assembly which includes: an electrode portion including a polymer electrolyte membrane, an anode electrode formed on a first surface of the polymer electrolyte membrane, and a cathode electrode formed on a second surface of the polymer electrolyte membrane; and a pair of gas diffusion layers (13A, 13B), one of which is in contact with an anode surface of the electrode portion at which the anode electrode is disposed and another of which is in contact with a cathode surface of the electrode portion at which the cathode electrode is disposed; and an electrode portion including a polymer electrolyte membrane, an anode electrode formed on a first surface of the polymer electrolyte membrane, and a cathode electrode formed on a second surface of the polymer electrolyte membrane; and a pair of gas diffusion layers (13A, 13B), one of which is in contact with an anode surface of the electrode portion at which the anode electrode is disposed and another of which is in contact with a cathode surface of the electrode portion at which the cathode electrode is disposed; and a pair of separators (3, 4) which sandwiches the electrode membrane assembly from respective the anode surface and the cathode surface, wherein: the electrode membrane assembly and each of the pair of separators (3, 4) are adhered to each other by a resin portion made of a resin which at least partially contains fibers, and at least a part of each of the pair of gas diffusion layers (13A, 13B) is impregnated with the resin, each of the pair of separators (3, 4) includes: a flow passage groove (8, 9) configured to supply and discharge one of a fuel gas and an oxidizing agent gas to and from the electrode portion; a pair of connecting grooves (10, 11) which are connected to a supply end and a discharge end of the flow passage groove (8, 9), respectively; and a pair of manifolds (6, 7) which are connected to the flow passage groove (8, 9) through the pair of connecting grooves (10, 11), respectively, and a plurality of different kinds of resins are stacked onto each other at parts of the resin portion which are exposed to the connecting grooves (10, 11). the electrode membrane assembly and each of the pair of separators (3, 4) are adhered to each other by a resin portion made of a resin which at least partially contains fibers, and at least a part of each of the pair of gas diffusion layers (13A, 13B) is impregnated with the resin, each of the pair of separators (3, 4) includes: a flow passage groove (8, 9) configured to supply and discharge one of a fuel gas and an oxidizing agent gas to and from the electrode portion; a pair of connecting grooves (10, 11) which are connected to a supply end and a discharge end of the flow passage groove (8, 9), respectively; and a pair of manifolds (6, 7) which are connected to the flow passage groove (8, 9) through the pair of connecting grooves (10, 11), respectively, and a plurality of different kinds of resins are stacked onto each other at parts of the resin portion which are exposed to the connecting grooves (10, 11).