Provided is a fuel injection device (1) equipped with a pilot fuel injection valve (3) and a ring-shaped main fuel injection valve (5) that girdles the outer circumference of the pilot fuel injection valve, wherein: the fuel injection device comprises a fuel injection unit (13) that injects fuel into a combustion chamber, a fuel supply unit (15) that supplies fuel to the fuel injection unit (13), a fuel introduction unit (9) that is attached to a combustor housing and introduces fuel into the fuel supply unit (15), and an injection valve housing (21) that covers the front section of the pilot fuel injection valve and of the main fuel injection valve; the base section of the fuel supply unit (15) is supported by the fuel introduction unit (9); and a ring-shaped main body section (15b) is supported by a support pin (25) so as to be capable of moving in the radial direction relative to the injection valve housing (21).
