Membrane electrode complex and solid type fuel cell using it

RwWnfWfc+WnfA polymer electrolytic material has excellent proton conductivity and excellent fuel shutting property, and accordingly provide a polymer electrolytic fuel cell with a high efficiency. This polymer electrolytic material has an unfreezable water ratio Rw defined by the following expression (S1) in a range of 20 to 100% by weight in hydrated state: 1=[/()]×100 (S1) in which Wnf represents the unfreezable water content per 1 g of the polymer electrolytic material in dry state and Wfc represents the low freezing point water content per 1 g of the polymer electrolytic material in dry state.