An object of the present invention is to solve the problems with conventional polymer electrolyte fuel cells and provide a proton conducting membrane which exhibits an excellent heat resistance and an excellent protonic conductivity and a high dimensional ...

An electrolyte membrane characterized by comprising a porous body formed from a melt-moldable fluororesin and having interconnected pores and an ion exchange resin with which the interconnected pores are filled, is provided. Specifically, the porous body i...