A fuel feed device installation structure in which a set plate on which the fuel feed device is installed is not dissolved nor deteriorated by exposure to snow melt salt sprayed in winter in cold regions or sea salt particulate contained in salty wind in coastal districts, the fuel feed device comprising a fuel pump (2) which is disposed in a fuel tank and force-feeds fuel to an internal combustion engine, the set plate (3) made of synthetic resin which supports the fuel pump (2) and clogs an opening hole (1a) to the fuel tank (1), a gasket (5) which keeps an air-tightness between the set plate (3) and the fuel tank (1), and a plate (4) which holds the set plate (3) to the fuel tank (1), wherein protective members (6, 8) made of those materials which do not react with, or is not dissolved nor deteriorated by, a product generated by a chemical reaction between the plate (4) and the set plate (3) are inserted between the plate (4) and the set plate (3).