NOVELTY - The separator (20) has a main body plate (22) bonded to an outer surface of a flow field plate (21) to seal a reaction gas flow field, where the field plate includes protrusions (21a) that protrude from surfaces of the field plate in a repetitive pattern. The field plate includes a land portion (21b) bonded to a gas diffusion layer (12) at a sharp tip of one of the protrusions protruding from one of surfaces of the field plate and a bonding portion (21c) bonded to the body plate at an opposite sharp tip of the other protrusion protruding from the other surface of the plate.    USE - Separator such as graphite separator and metallic separator, for a fuel cell i.e. Polymer Electrolyte Membrane Fuel Cell (PEMFC) that is used as a power source for a vehicle i.e. motor vehicle motor e.g. passenger automobile such as sports utility vehicle (SUV), bus, truck, commercial vehicle, watercraft e.g. boats and ships, aircraft, hybrid vehicle e.g. gasoline-powered and electric-powered vehicles, electric vehicle, plug-in hybrid electric vehicle, and hydrogen-powered vehicle. Can also be used as a power source in independent power generation, transport and military fields.    ADVANTAGE - The land portion is bonded to the gas diffusion layer with a dotted line contact structure, so that differences of gas diffusion and concentration between areas in the diffusion layer that are bonded to the land portion and the flow field portion of the flow field plate can be minimized, so that uniform concentration distribution is enabled, and uniform gas diffusion, uniform electrochemical reaction and uniform electricity generation can be achieved over reaction area, thus improving performance of a fuel cell, and hence increasing current density of the fuel cell, while enabling operation at a high power section.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a flow field plate for a fuel cell separator.    DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a separator.    Gas diffusion layer (12)    Separator (20)    Flow field plate (21)    Protrusions (21a)    Land portion (21b)    Bonding portion (21c)    Main body plate (22)