An MEA member comprising: an MEA including a polymer electrolyte membrane and a pair of electrodes respectively disposed on both main surfaces of the polymer electrolyte membrane; a plate-shaped resin frame configured to sandwich and hold a peripheral portion of main surfaces of the MEA from both sides of the MEA such that the MEA is located inside the frame; and a separating portion configured to separate the MEA from the frame, wherein: the separating portion is a broken-line cutoff line formed on the frame to divide the frame into two or more parts; when viewed from a thickness direction of the polymer electrolyte membrane, the cutoff line is constituted by a plurality of slits which are formed at a portion of the frame at which portion the frame and the peripheral portion of the MEA overlap each other and each of which reaches the peripheral portion of the MEA; and the plurality of slits are alternately and consecutively formed on a first main surface and second main surface of the frame, or the plurality of slits are formed on both the first main surface and second main surface of the frame such that the slit on the first main surface and the slit on the second main surface are opposed to each other with the peripheral portion of the MEA interposed therebetween. an MEA including a polymer electrolyte membrane and a pair of electrodes respectively disposed on both main surfaces of the polymer electrolyte membrane; a plate-shaped resin frame configured to sandwich and hold a peripheral portion of main surfaces of the MEA from both sides of the MEA such that the MEA is located inside the frame; and a separating portion configured to separate the MEA from the frame, wherein: the separating portion is a broken-line cutoff line formed on the frame to divide the frame into two or more parts; when viewed from a thickness direction of the polymer electrolyte membrane, the cutoff line is constituted by a plurality of slits which are formed at a portion of the frame at which portion the frame and the peripheral portion of the MEA overlap each other and each of which reaches the peripheral portion of the MEA; and the plurality of slits are alternately and consecutively formed on a first main surface and second main surface of the frame, or the plurality of slits are formed on both the first main surface and second main surface of the frame such that the slit on the first main surface and the slit on the second main surface are opposed to each other with the peripheral portion of the MEA interposed therebetween. the separating portion is a broken-line cutoff line formed on the frame to divide the frame into two or more parts; when viewed from a thickness direction of the polymer electrolyte membrane, the cutoff line is constituted by a plurality of slits which are formed at a portion of the frame at which portion the frame and the peripheral portion of the MEA overlap each other and each of which reaches the peripheral portion of the MEA; and the plurality of slits are alternately and consecutively formed on a first main surface and second main surface of the frame, or the plurality of slits are formed on both the first main surface and second main surface of the frame such that the slit on the first main surface and the slit on the second main surface are opposed to each other with the peripheral portion of the MEA interposed therebetween.