According to the membrane electrode assembly for solid polymer electrolyte fuel cell in which a polyarylene based copolymer having a specific repeating constitutional unit is used as a proton conductive membrane, the membrane electrode assembly for solid polymer electrolyte fuel cell that exhibits superior dimensional stability to {HEAD ~ high temperature} of hot water generated on power generation, and that has both excellent power generation performance and {TAIL ~ durability} in a low temperature environment can be provided 
According to the membrane electrode assembly for solid polymer electrolyte fuel cell in which a polyarylene based copolymer having a specific repeating constitutional unit is used as a proton conductive membrane , the membrane electrode assembly for solid polymer electrolyte fuel cell that exhibits superior dimensional stability to { HEAD ~ high temperature } of hot water generated on power generation , and that has both excellent power generation performance and { TAIL ~ durability } in a low temperature environment can be provided
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