NOVELTY - Manufacturing of a battery electrode (13) involves adjusting an electrode layer forming composition including a first electrode material (1) having a larger particle size than an opening size of a porous collector (5), and a second electrode material (2) having a smaller particle size than the opening size of the porous collector; and applying the composition to the porous collector.    USE - For manufacturing battery electrode which is used in metal-air battery (claimed), lithium battery, and fuel cell.    ADVANTAGE - The battery electrode achieves excellent performance, by using a combination of the porous collector and at least two electrode materials having different particle sizes which enables an electrode layer having a multilayered structure to be easily formed. The porous collector has metallic or carbon material with excellent electron conductivity. The method provides an air electrode with excellent power generating efficiency.    DETAILED DESCRIPTION - Manufacturing of a battery electrode involves adjusting an electrode layer forming composition including a first electrode material having a larger particle size than an opening size of a porous collector, and a second electrode material having a smaller particle size than the opening size of the porous collector; and applying the composition to the porous collector. The composition further includes a binder (3) that improves the adhesion between the electrode materials; and solvent that improves the dispersibility between the electrode materials. The first or second electrode material is at least one of a catalyst, conductive material, water-repellent material, active material or solid electrolyte. The first electrode material is catalyst. The second electrode material is conductive material. The porous collector is a collector using metallic material or carbon material. An INDEPENDENT CLAIM is included for a battery electrode comprising the porous collector, an inner electrode layer (11) including the second electrode material that is formed in the surface of the porous collector, and an outer electrode layer (12) including the first electrode material that is formed on the inner electrode layer.    DESCRIPTION OF DRAWING(S) - The figure shows a sectional view of battery electrode manufacturing method.    First electrode material (1)    Second electrode material (2)    Binder (3)    Porous collector (5)    Inner electrode layer (11)    Outer electrode layer (12)    Battery electrode (13)