NOVELTY - Conductive separator plate for polymer electrolyte fuel cell is formed of a molded plate comprising a carbon powder and a binder; and has a main portion which is raised from a peripheral portion surrounding the main portion, is in contact with an anode or cathode and is provided with gas flow path for supplying a fuel gas to the anode or for supplying an oxidant gas to the cathode.    USE - The conductive separator plate is used for a polymer electrolyte fuel cell (claimed) which is used for portable power sources, electric vehicle power sources or domestic cogeneration systems.    ADVANTAGE - The plate makes it possible to make the degree of compression of the gaskets larger and at the same time allows the separator plates to press against the gas diffusion layers of the electrodes so even with the use of thick gaskets, it is possible to produce gas leakage-free sealing effect while securing contact between the separator plates and thin gas diffusion layers. It enables reduction in contact resistance between the electrodes and the separator plates and application of thinner gas diffusion layers.    DETAILED DESCRIPTION - Conductive separator plate (10) for a polymer electrolyte fuel cell is formed of a molded plate comprising a carbon powder and a binder; and has a main portion (16c) which is raised from a peripheral portion (17c) surrounding the main portion, is in contact with an anode or cathode, and is provided with a gas flow path (18) for supplying a fuel gas to the anode or a gas flow path for supplying an oxidant gas to the cathode. The polymer electrolyte fuel cell comprises a cell stack comprising several membrane electrode assemblies and several conductive separator plates that are stacked alternately. Each membrane electrode assembly comprises a hydrogen ion conductive polymer electrolyte membrane sandwiched between an anode and a cathode, and a pair of gaskets which surrounds the anode and the cathode and sandwiches a periphery of the polymer electrolyte membrane. The conductive separator plates comprise at least one pair of an anode-side conductive separator plate and a cathode-side conductive separator plate sandwiching one of the membrane electrode assemblies under pressure. The pair of gaskets is compressed between the peripheral portion of the anode-side conductive separator plate and the peripheral portion of the cathode-side conductive separator plate.    DESCRIPTION OF DRAWING(S) - The figure is a front view of a cathode side of a conductive separator plate used in a fuel cell.    Separator plate (10)    Pair of oxidant gas manifold apertures (12)    Pair of fuel gas manifold apertures (13)    Pair of cooling water manifold apertures (14)    Main portion (16c)    Peripheral portions (17c)    Gas flow path (18)