NOVELTY - The polymeric electrolyte fuel cell (150) has electrode assembly (100) having catalyst layer (120c,120a) containing electrode catalyst having catalyst particle supported by carbon support and electrolyte. Catalyst layer (121a,121c) does not having crack (123a,123c), and catalyst layer (122a,122c) having crack are laminated on assembly. Average particle diameter of catalyst particle in catalyst layer (120a,120c) is large towards exit side from entrance of gas passageway. Crystallinity of carbon support is high towards exit from entrance side of gas passageway.    USE - For motor vehicle (claimed).    ADVANTAGE - The polymer electrolyte fuel cell has high electric power generation ability. The reactive gas is efficiently supplied to catalyst of catalyst layer. The corrosion of carbon support and elution of catalyst particles are efficiently suppressed. The increase of electron transfer resistance of catalyst layer is suppressed.    DETAILED DESCRIPTION - The polymeric electrolyte fuel cell (150) has membrane electrode assembly (100) clamped with separator (140a,140c) having gas passageway. The assembly (100) has pair of catalyst layer (120c,120a) arranged at both sides of a solid polymer electrolyte film (110). The catalyst layer contains at least an electrode catalyst having catalyst particle supported by carbon support, and solid polymer electrolyte. The catalyst layer (121a,121c) does not having crack, and catalyst layer (122a,122c) having crack are laminated on electrode assembly along thickness direction. The average particle diameter of catalyst particle contained in catalyst layer (120a,120c) is large towards exit side from entrance of gas passage way. The crystallinity of carbon support is high towards exit from entrance side of gas passageway.    An INDEPENDENT CLAIM is included for motor vehicle.    DESCRIPTION OF DRAWING(S) - The figure shows the cross-section of polymer electrolyte fuel cell.    Membrane electrode assembly (100)    Polymeric electrolyte film (110)    Catalyst layers (120a,120c,121a,121c,122a,122c)    Cracks (123a,123c)    Separators (140a,140c)    Gas supply path (141)    Polymeric electrolyte fuel cell (150)