A polymer electrolyte membrane-electrode assembly including a proton
conductive membrane having superior workability is provided. The
membrane-electrode assembly for solid polymer electrolyte fuel cells
includes an anode electrode, a cathode electrode, and a proton conductive
membrane, the anode electrode and the cathode electrode being disposed on
opposite sides of the proton conductive membrane, in which the proton
conductive membrane includes a polyarylene having the constitutional unit
(S) expressed by the general formula (2-2) described below and the
constitutional unit (T) expressed by the general formula (2-3) described
below; the ratio s of the unit (S) in the polyarylene is 50 to 95 mole %,
and the ratio t of the unit (T) is 5 to 50 mole % in the polyarylene,
where s+t=100 mole %. ##STR00001##