Fuel cell electrolyte membrane, membrane electrode assembly, fuel cell and method of manufacturing fuel cell electrolyte membrane

A fuel cell electrolyte membrane includes a first electrolyte membrane formed from a basic polymer including a phosphoric acid, and second and third electrolyte membranes each formed from a basic polymer including a phosphoric acid and clamping the first electrolyte membrane between the second and third electrolyte membranes. The phosphoric acid contained in the first electrolyte membrane is greater than the phosphoric acid contained in each of the second and third electrolyte membranes in concentration.