It reinforced solid polymer electrolyte composite membrane, a solid polymer electrolyte fuel cell membrane electrode assembly and a solid polymer electrolyte fuel cell

Stability has a solid polymer electrolyte fuel cell of the present invention provides improved operation over time. The solid polymer electrolyte composite membrane reinforced by the present invention comprises two or more reinforced solid polymer electrolyte membrane layer and one or more layers of sheet-like porous reinforcing member of the solid polymer electrolyte fuel cell with high polymer electrolyte composite membrane, characterized in that the composite film, the polymer electrolyte membrane disposed on the inner and outer sides of the composite film, the sheet-like porous reinforcing member are substantially filled the pores of the polymer electrolyte the electrolyte membrane, and the sheet-like porous reinforcing member contains a peroxide decomposition catalyst.