ELECTROLYTE MATERIAL, LIQUID COMPOSITION, AND MEMBRANE -ELECTRODE ASSEMBLY FOR POLYMER ELECTROLYTE FUEL CELL

It is to provide a membrane/electrode assembly excellent in the power generation characteristics under low or no humidity conditions and under high humidity conditions, and an electrolyte material suitable for a catalyst layer of the membrane/electrode assembly. It is to use an electrolyte material, which comprises a polymer (H) having ion exchange groups converted from precursor groups in a polymer (F) having repeating units (A) having a precursor group represented by the formula (g1) and repeating units (B) based on a perfluoromonomer having a 5-membered ring, and having a density of at most 2.03 g/cm 3 , the polymer (H) having an ion exchange capacity of from 1.3 to 2.3 meq/g dry resin: wherein Q 1 and Q 2 are a perfluoroalkylene group having an etheric oxygen atom, or the like, and Y is F or the like.