an oxygen pump 13 for supplying oxygen from air to the stack 7 the stack includes a plurality of electricity generating units 19 each comprising a membrane electrode assembly 21 and separators 23 and 25 each membrane electrode assembly 21 comprises a polymer electrode member with an anode on a first side and a cathode on a second side to manufacture the fuel cell a conventional method can be used and thus a detailed description is omitted herein the polymer electrolyte membrane according to an embodiment of the present invention minimizes the methanol crossover by using the polymer matrix which suppresses swelling by minimizing the number of ion conductive terminal groups and significantly improves the ionic conductivity by distributing the oligomer solid acid macromolecules which has ion conductive terminal groups on the surface and a large volume thereby hardly escaping the polymer matrix in which they are distributed accordingly the polymer electrolyte membrane according to an embodiment of the present invention sustains high ionic conductivity even in non humidified conditions in an embodiment as shown in fig6 a membrane electrode assembly mea of the present invention includes an anode 30 to which a fuel is supplied a cathode 50 to which an oxidant is supplied and an electrolyte membrane 130 interposed between the anode 30 and the cathode 50 the anode 30 can be composed of.