The fuel supplying apparatus of the invention includes a fuel injector 1 injecting a fuel; a fuel tank 2; fuel paths 4 and 5 connecting the fuel injector 1 and the fuel tank 2; a low-pressure fuel pump 10 provided in the upstream; a high-pressure fuel pump 3 which is provided between the low-pressure fuel pump 10 and the fuel injector 1, a cylinder having a hole 41a, and a plunger 43 arranged reciprocally movably in the hole 41a, sucks and pressurizes the fuel through a suction port 5c into the fuel pressurizing chamber 45, discharges the pressurized fuel from a discharge port 4d, and pressure-transfers the fuel to the fuel injector 1; and a high-pressure regulator, which is provided between the high-pressure fuel pump 3 of the fuel path 4 and adjusts pressure of the fuel discharged from the high-pressure fuel pump 3.