A gas turbine combined cycle facility (10A, 10B) for use on vessels or floating structures, comprising: a gas turbine unit provided with an intake duct; a heat recovery steam generator for recovering exhaust gas from exhaust gas produced by the gas turbine unit and producing steam, including a boiler body; an exhaust duct for guiding the exhaust gas of the gas turbine unit to the heat recovery steam generator; and a supporting frame which supports the gas turbine unit, the heat recovery steam generator, and the exhaust duct, characterized in that the supporting frame includes a plurality of base members (71A, 71B, 71C) which are arranged in a vertical direction, the plurality of base members (71A, 71B, 71C) includes a first base member positioned on an uppermost layer, a second base member positioned on an intermediate layer, and a third base member positioned on a lowermost layer, wherein the area of the third base member is larger than the area of the second base member, the intake duct is disposed on the first base member, the gas turbine unit is disposed on the second base member, the heat recovery steam generator is disposed on the third base member, the height of the heat recovery steam generator is such that the boiler body reaches a position above the second base member, and at least a portion of the heat recovery steam generator is disposed at the same position as the gas turbine engine in a height direction, and the heat recovery steam generator is disposed side-by-side so that a direction in which exhaust gas flows in the heat recovery steam generator is parallel to a turbine axis direction of the gas turbine unit. a gas turbine unit provided with an intake duct; a heat recovery steam generator for recovering exhaust gas from exhaust gas produced by the gas turbine unit and producing steam, including a boiler body; an exhaust duct for guiding the exhaust gas of the gas turbine unit to the heat recovery steam generator; and a supporting frame which supports the gas turbine unit, the heat recovery steam generator, and the exhaust duct, characterized in that the supporting frame includes a plurality of base members (71A, 71B, 71C) which are arranged in a vertical direction, the plurality of base members (71A, 71B, 71C) includes a first base member positioned on an uppermost layer, a second base member positioned on an intermediate layer, and a third base member positioned on a lowermost layer, wherein the area of the third base member is larger than the area of the second base member, the intake duct is disposed on the first base member, the gas turbine unit is disposed on the second base member, the heat recovery steam generator is disposed on the third base member, the height of the heat recovery steam generator is such that the boiler body reaches a position above the second base member, and at least a portion of the heat recovery steam generator is disposed at the same position as the gas turbine engine in a height direction, and the heat recovery steam generator is disposed side-by-side so that a direction in which exhaust gas flows in the heat recovery steam generator is parallel to a turbine axis direction of the gas turbine unit.