The invention provides a separator for a fuel cell, a manufacturing method and a conductive corrosionproof metallic material therefor. The separator for a fuel cell is characterized by having good corrosivity and conductivity even in a fuel cell environment with severe electrochemical conditions, lightweighting and well processability. In the separator for a fuel cell, bonding metal layers 12A and 12B consisting of pure aluminum or an aluminum alloy without containing magnesium are formed on a surface of a core 11 made of an aluminum alloy or a magnesium alloy; corrosionproof coating layers 13A and 13B made of titanium or a titanium alloy are formed on surfaces of the bonding metal layers; on surfaces of the coating layers 13A and 13B, conductive protective coating films 14A and 14B are formed.