A polymer electrolyte membrane comprising: a porous support including a web of nanofibers of a first hydrocarbon-based ion conductor arranged irregularly and discontinuously; and a second hydrocarbon-based ion conductor filling the pores of the porous support, wherein the first hydrocarbon-based ion conductor is a product obtained by eliminating at least a portion of the protective groups in a precursor of the first hydrocarbon-based ion conductor represented by the following Formula: wherein in Formula, m represents 0.01 to 0.1; p and q each represent an integer from 0 to 4, while p and q are not zero at the same time; M and M' each independently represent any one selected from the group consisting of a hydrogen atom, a metal cation and an ammonium cation; X represents a divalent organic group represented by the following Formula; and Y represents a protective group which is a divalent organic group represented by the following Formula: wherein in Formulas and, Ar 1 and Ar 2 each independently represent an arylene group having 6 to 18 carbon atoms; R 1 and R 2 each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, or are bonded to each other and form a heterocyclic ring together with Z and Z'; X 1 represents a single bond, or represents any one selected from the group consisting of an alkylene group having 1 to 5 carbon atoms and a fluoroalkylene group having 1 to 5 carbon atoms; and Z and Z' each independently represent an oxygen atom or a sulfur atom. a porous support including a web of nanofibers of a first hydrocarbon-based ion conductor arranged irregularly and discontinuously; and a second hydrocarbon-based ion conductor filling the pores of the porous support, wherein the first hydrocarbon-based ion conductor is a product obtained by eliminating at least a portion of the protective groups in a precursor of the first hydrocarbon-based ion conductor represented by the following Formula: wherein in Formula, m represents 0.01 to 0.1; p and q each represent an integer from 0 to 4, while p and q are not zero at the same time; M and M' each independently represent any one selected from the group consisting of a hydrogen atom, a metal cation and an ammonium cation; X represents a divalent organic group represented by the following Formula; and Y represents a protective group which is a divalent organic group represented by the following Formula: wherein in Formulas and, Ar 1 and Ar 2 each independently represent an arylene group having 6 to 18 carbon atoms; R 1 and R 2 each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, or are bonded to each other and form a heterocyclic ring together with Z and Z'; X 1 represents a single bond, or represents any one selected from the group consisting of an alkylene group having 1 to 5 carbon atoms and a fluoroalkylene group having 1 to 5 carbon atoms; and Z and Z' each independently represent an oxygen atom or a sulfur atom. m represents 0.01 to 0.1; p and q each represent an integer from 0 to 4, while p and q are not zero at the same time; M and M' each independently represent any one selected from the group consisting of a hydrogen atom, a metal cation and an ammonium cation; X represents a divalent organic group represented by the following Formula; and Y represents a protective group which is a divalent organic group represented by the following Formula: wherein in Formulas and, Ar 1 and Ar 2 each independently represent an arylene group having 6 to 18 carbon atoms; R 1 and R 2 each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, or are bonded to each other and form a heterocyclic ring together with Z and Z'; X 1 represents a single bond, or represents any one selected from the group consisting of an alkylene group having 1 to 5 carbon atoms and a fluoroalkylene group having 1 to 5 carbon atoms; and Z and Z' each independently represent an oxygen atom or a sulfur atom. Ar 1 and Ar 2 each independently represent an arylene group having 6 to 18 carbon atoms; R 1 and R 2 each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, or are bonded to each other and form a heterocyclic ring together with Z and Z'; X 1 represents a single bond, or represents any one selected from the group consisting of an alkylene group having 1 to 5 carbon atoms and a fluoroalkylene group having 1 to 5 carbon atoms; and Z and Z' each independently represent an oxygen atom or a sulfur atom.