To provide a solid high polymer type electrolyte film, in which crossover phenomenon is not generated to methanol, so that proton can be efficiently sent through.

This solid high polymer type electrolyte film is composed of polyphosphazene having ion dissociated groups. In the solid high polymer type electrolyte film, polyphosphazene having ion dissociated groups is represented by general formula (1). In the general formula (1), R is aryl group having ion dissociated groups. Part of it may be either of aryl group, alkyl group, or parfluoroalkyl group without having ion dissociated groups, and n is an integer of 1,000-100,000.