PURPOSE: To prevent the occurrence of rupture, by a method wherein a combustor, a gas generator turbine part, and a power turbine part are supported to a casing through the energizing forces of respective springs.

CONSTITUTION: A gas generator turbine part 6 is supported to a main casing 1 through the forces of soil springs 46, 54, and 75. A power turbine part 7 is supported to the main casing 1 through the forces of the coil springs 54 and 75. A transition duct 1 making contact with a turbine inlet duct 16 of a combustor is supported to the main casing 1 through the force of a coil spring. This constitution absorbs a difference in thermal expansion through the forces of the coil springs, and enables prevention of rapture of each constituting part.