To provide a micromachine gas turbine capable of improving the heating efficiency by reducing the heat loss from a wall face.

In this micromachine gas turbine, the air is compressed by the rotation of a rotor 2, and fuel is combusted by using the compressed air, and the rotor is rotated and driven by the generated combustion gas. The micromachine gas turbine is provided with an air partition 12 for partitioning a compressed air passage 11 at a compressor side of a compression chamber 8, and a fuel partition 14 for partitioning a fuel gas passage 13 at a turbine side. The fuel partition is provided with a direct injection nozzle 14a for directly injecting the fuel gas to the combustion chamber. The fuel flows along the fuel partition 14 in the fuel gas passage 13 to cool the fuel partition, and the heated fuel is directly injected from the direct injection nozzle 14a to the combustion chamber.