Polymer electrolyte membrane

A polymer electrolyte membrane comprising:

• a polymer including a unit represented by the following Chemical Formula 1;
• and
• inorganic particles:
• wherein, in Chemical Formula 1, A is —SO3H, —SO3−M+, —COOH, —COO−M+, —PO3H2, —PO3H−M+, —PO32−2M+, —O(CF2)mSO3H, —O(CF2)mSO3−M+, −O(CF2)mCOOH, −O(CF2)mCOO−M+, —O(CF2)mPO3H2, —O(CF2)mPO3H−M+or —O(CF2)mPO32−2M+;
• m is an integer of 2 to 6;
• M is a group 1 element;
• R1 and R2 are the same as or different from each other, and each independently a halogen group;
• and
• n is an integer of 2 to 10, and structures in the 2 to 10 parentheses are the same as or different from each other.