To provide a polymer electrolyte membrane with excellentradical resistance, a polymer electrolyte composition for thepolymer electrolyte membrane, and further a polymer electrolytetype fuel cell using the polymer electrolyte membrane.[1] A polymer electrolyte composition comprising the followingcomponent (a), (b) and (c):(a) a polymer electrolyte having a strong acid group,(b) a compound having at least one group containing apentavalent phosphorous atom, and(c) an antioxidant[2] The polymer electrolyte composition described in the above[1], wherein the component (b) comprises a copolymer expressedby the following formula (6):wherein Z represents a sulfonyl group or a carbonyl group, Arrepresents a divalent aromatic group, R1 and R2 represent ahydrogen atom or a monovalent organic group.[3] A polymer electrolyte membrane obtained using the polymerelectrolyte composition of the above [1] or [2].[4] A fuel cell composed of the polymer electrolyte membranedescribed in the above [3].
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