POLYELECTROLYTE, POLYELECTROLYTE FILM, AND FUEL CELL

There are disclosed a polyelectrolyte comprising at least a styrenic polymer having a syndiotactic configuration and exhibiting an ion exchange capability, a polyelectrolyte membrane produced by forming the polyelectrolyte into a film, and a fuel cell using the polyelectrolyte membrane. The polyelectrolyte of the present invention is inexpensive and exhibits a good long-term stability, and is suitably used for fuel cells, production of common salt from sea water and recovery of acids from waste water.