NOVELTY - A polymer electrolyte fuel cell comprises: (i) hydrogen ion conductive polymer electrolyte membrane; (ii) pair of electrodes; (iii) pair of conductive separators; and gaskets.    USE - Used as polymer electrolyte fuel cell for semi-finished product (claimed), e.g. portable power sources, electric vehicle power sources, or domestic co-generation systems.    ADVANTAGE - The polymer electrolyte fuel cell has long-term reliability, and has reduced deterioration in performance caused by components leaching out during its use.    DETAILED DESCRIPTION - A polymer electrolyte fuel cell comprises:    (a) hydrogen ion conductive polymer electrolyte membrane;    (b) pair of electrodes (7) sandwiching the membrane;    (c) pair of conductive separators each having gas flow channels, one of which supplies a fuel gas to one of the electrodes and the other supplies an oxidant gas to the other electrode; and    (d) gaskets, each of which is sandwiched between the conductive separator and the electrolyte membrane to surround the periphery of the electrode and the gas flow channel.    The conductive separator and/or the gasket is made from a material such that not more than 300 microg total organic carbon (TOC), not more than 50 microg ammonium ions, not more than 50 microg chloride ions, not more than 20 microg bromide ions, and not more than 10 microg sulfite ions leaches into the water when a weight unit of 1 g of the material at not more than 50 hours, within which the material, the separator, the gasket or its or their semi-finished product(s) are kept immersed in water of 80-100degreesC.    An INDEPENDENT CLAIM is also included for manufacturing the polymer electrolyte fuel cell by mixing a conductive carbon material, a binder resin, and a trapping agent; and molding the obtained mixture into a conductive separator by compression molding, injection molding or transfer molding.    DESCRIPTION OF DRAWING(S) - The figure is a schematic view of the polymer electrolyte fuel cell.    Reaction bath (1)    Electrolyte (2)    Platinum wire (3)    Platinum mesh (4)    Fuel supplier (5)    Salt bridge (6)    Electrode (7)