In accordance with the present invention, the above and other objects can be accomplished by the provision of a membrane-electrode assembly for fuel cells including an anode and a cathode facing each other, and a polymer electrolyte membrane interposed between the anode and the cathode, wherein at least one of the anode and the cathode further includes a porous support and a catalyst layer for fuel cells disposed on one surface of the porous support.

At least one of the anode and the cathode may be disposed such that the other surface of the porous support on which the catalyst layer is not disposed faces the polymer electrolyte membrane.

The catalyst layer may be disposed on the surface of the porous support.

The catalyst layer may permeate the porous support while filling inner pores of the porous support.

The catalyst layer may include a catalyst and a binder resin.

The porous support may include a first region where the catalyst and the binder resin of the catalyst layer permeate, and a second region where only the binder resin of the catalyst layer permeates.

The first region of the porous support may be disposed under the catalyst layer and the second region of the porous support may be disposed under the first region of the porous support.

The polymer electrolyte membrane may be disposed under the second region of the porous support.

A ratio of a total thickness of the catalyst layer and the first region to a thickness of the second region may be 1:1 to 10:1.

A content of the binder resin in the catalyst layer may be 20 to 40% by weight with respect to the total weight of the catalyst layer.