A method for producing an electrode-membrane-frame assembly in which a frame is formed on a circumferential region of a membrane-electrode assembly, the membrane-electrode assembly having a first catalyst layer (5B1) arranged on a first main surface of a polymer electrolyte membrane, a first gas diffusion layer (5C1) arranged on a main surface of the first catalyst layer (5B1), a second catalyst layer (5B2) arranged on a second main surface of the electrolyte membrane, and a second gas diffusion layer (5C2) arranged on a main surface of the second catalyst layer (5B2), the method comprising the steps of: arranging a first molded body on a side of the first main surface of the electrolyte membrane so that a circumferential region of the electrolyte membrane overlaps with at least an inner edge part of the first molded body, the first molded body being previously molded and having a frame shape, when viewed from a thickness direction of the electrolyte membrane, arranging a second molded body on a side of the second main surface of the electrolyte membrane so that the circumferential region of the electrolyte membrane overlaps with at least an inner edge part of the second molded body, the second molded body being previously molded and having a frame shape, when viewed from the thickness direction of the electrolyte membrane, and forming the frame including the first molded body, the second molded body, and a third molded body by forming the third molded body between the first molded body and the second molded body by injection molding so as to integrally connect the first molded body and the second molded body and not to be directly in contact with an inner side region of the second main surface of the electrolyte membrane positioned on an inner side of an outer edge part of the second molded body when viewed from the thickness direction of the electrolyte membrane after arranging the first molded body and arranging the second molded body. arranging a first molded body on a side of the first main surface of the electrolyte membrane so that a circumferential region of the electrolyte membrane overlaps with at least an inner edge part of the first molded body, the first molded body being previously molded and having a frame shape, when viewed from a thickness direction of the electrolyte membrane, arranging a second molded body on a side of the second main surface of the electrolyte membrane so that the circumferential region of the electrolyte membrane overlaps with at least an inner edge part of the second molded body, the second molded body being previously molded and having a frame shape, when viewed from the thickness direction of the electrolyte membrane, and forming the frame including the first molded body, the second molded body, and a third molded body by forming the third molded body between the first molded body and the second molded body by injection molding so as to integrally connect the first molded body and the second molded body and not to be directly in contact with an inner side region of the second main surface of the electrolyte membrane positioned on an inner side of an outer edge part of the second molded body when viewed from the thickness direction of the electrolyte membrane after arranging the first molded body and arranging the second molded body.