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 stability even at high temperatures, a method for producing the same and a fuel cell using the same.The proton conducting membrane of the present invention is a proton conducting membrane having particles 1 comprising a metal-oxygen crosslinked structure and the particles 1 have an acid group such as sulfonic acid group incorporated in the surface thereof and form a continuity. The gap 2 between the particles is communicated from the main surface to the opposite surface of the proton conducting membrane to form a proton conducting channel.