Abstract: To obtain a fuel cell bipolar plate of high quality and high productivity with less deformation, warpage, and cracking at the time of product removal from a die by making equal the density balance between a gas flow passage groove part area and a surrounding part area on the surface of the bipolar plate. A (upper) lower inner die (42,) 22 is positioned at a prescribed height (under or) above a (upper) lower outer die (45,) 25 so that the compression ratio of a flow passage groove part 2 and the compression ratio of a surrounding part 4 are equal when a cavity 50 formed between upper and lower dies 41 and 21 divided into the upper and lower inner dies 42 and 22 corresponding to the flow passage groove part 2 and the upper and lower outer dies 45 and 25 corresponding to a surrounding part 4, respectively, is filled with a powder-like material.