NOVELTY - Fuel cell metallic separator comprises a metallic plate having alternating ridges and grooves in a cross section which are formed by pressing. Each of the ridge portions (10) has a flattened surface (12) which is brought into contact with a membrane electrode assembly. The flattened surface is formed by removing a part of the ridged portion surface (11) after pressing.    USE - The metallic separator can be installed in a proton-exchange membrane fuel cell.    ADVANTAGE - Since the area of the surfaces of the ridged portions of the separator which contact the membrane electrode assembly is increased, the contact resistance is reduced and the power generating performance is improved.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (i) a method for manufacturing a fuel cell metallic separator comprising: forming a metallic plate having alternate ridges and grooves in a cross section by pressing; and removing a part of each of the ridged portions so that each of the ridge portions has a flattened surface;    (ii) a fuel cell comprising: a membrane electrode assembly; and a metallic separator as above;    (iii) a fuel cell metallic separator formed by rolling a metallic material having conductive inclusions and removing a surface of the metallic material after rolling by an amount corresponding to at least 2% of a thickness of metallic material after rolling so that the conductive inclusions are allowed to protrude from the surface of the metallic material after rolling;    (iv) a method of manufacturing a fuel cell metallic separator comprising: obtaining a blank by rolling a metallic material having conductive inclusions; and removing a surface of the blank by an amount corresponding to 2 % or more of a thickness of the blank so that conductive inclusions are allowed to protrude from the surface;    (v) a method for manufacturing a fuel cell metallic separator having conductive inclusions in its metallic texture, comprising: blasting a liquid containing two or more kinds of abrasives having different particle diameters to a blank that has been rolled; and    (vi) a method for manufacturing a fuel cell metallic separator having conductive inclusions in its metal texture, comprising: blasting a passivation treatment liquid mixed with abrasives to the separator.    DESCRIPTION OF DRAWING(S) - The drawing shows the concept of a separator.    Ridged portion (10)    Surface (11)    Flattened surface (12)