A polymer electrolyte membrane for a polymer electrolyte fuel cell, that overcomes disadvantages of the conventional polymer ion-exchange membranes including fluorine-based polymer electrolyte membranes and can maintain cell characteristics even in use ove...

The present invention relates to a proton-conductive polymer membrane comprising a polymer compound which has structural repeating units represented by the following formula (1) in which the aromatic units are partially substituted with proton-conductive s...