A membrane-electrode assembly comprising: a polymer electrolyte membrane; one or more membrane-like first membrane reinforcing members disposed on a main surface of the polymer electrolyte membrane so as to extend along a peripheral edge of the polymer electrolyte membrane as a whole; one or more membrane-like second membrane reinforcing members disposed on the first membrane reinforcing members so as to extend along the peripheral edge of the polymer electrolyte membrane as a whole and disposed such that when viewed from a thickness direction of the polymer electrolyte membrane, an inner edge of the second membrane reinforcing member and an inner edge of the first membrane reinforcing member do not coincide with each other; a first catalyst layer disposed to cover at least a part of one of the main surfaces of the polymer electrolyte membrane; a second catalyst layer disposed to cover at least a part of the other main surface of the polymer electrolyte membrane; a first gas diffusion layer disposed to cover at least a part of a main surface of the first catalyst layer, and a second gas diffusion layer disposed to cover at least a part of a main surface of the second catalyst layer, wherein: the first membrane reinforcing member and the second membrane reinforcing member are disposed on each of both main surfaces of the polymer electrolyte membrane; and when viewed from the thickness direction of the polymer electrolyte membrane, the first gas diffusion layer is disposed so as to cover said one or more second membrane reinforcing members disposed on said one main surface of the polymer electrolyte membrane, and the second gas diffusion layer is disposed so as to cover said one or more second membrane reinforcing members disposed on the other main surface of the polymer electrolyte membrane. a polymer electrolyte membrane; one or more membrane-like first membrane reinforcing members disposed on a main surface of the polymer electrolyte membrane so as to extend along a peripheral edge of the polymer electrolyte membrane as a whole; one or more membrane-like second membrane reinforcing members disposed on the first membrane reinforcing members so as to extend along the peripheral edge of the polymer electrolyte membrane as a whole and disposed such that when viewed from a thickness direction of the polymer electrolyte membrane, an inner edge of the second membrane reinforcing member and an inner edge of the first membrane reinforcing member do not coincide with each other; a first catalyst layer disposed to cover at least a part of one of the main surfaces of the polymer electrolyte membrane; a second catalyst layer disposed to cover at least a part of the other main surface of the polymer electrolyte membrane; a first gas diffusion layer disposed to cover at least a part of a main surface of the first catalyst layer, and a second gas diffusion layer disposed to cover at least a part of a main surface of the second catalyst layer, wherein: the first membrane reinforcing member and the second membrane reinforcing member are disposed on each of both main surfaces of the polymer electrolyte membrane; and when viewed from the thickness direction of the polymer electrolyte membrane, the first gas diffusion layer is disposed so as to cover said one or more second membrane reinforcing members disposed on said one main surface of the polymer electrolyte membrane, and the second gas diffusion layer is disposed so as to cover said one or more second membrane reinforcing members disposed on the other main surface of the polymer electrolyte membrane. the first membrane reinforcing member and the second membrane reinforcing member are disposed on each of both main surfaces of the polymer electrolyte membrane; and when viewed from the thickness direction of the polymer electrolyte membrane, the first gas diffusion layer is disposed so as to cover said one or more second membrane reinforcing members disposed on said one main surface of the polymer electrolyte membrane, and the second gas diffusion layer is disposed so as to cover said one or more second membrane reinforcing members disposed on the other main surface of the polymer electrolyte membrane.