The present invention relates to a gas turbine including a pre-swirl system, capable of preventing flow disturbance. The gas turbine has an air inflow duct enabling air to flow inside by a pre-swirl system, and the air inflow duct comprises multiple partial ducts. The gas turbine includes: a casing; a compressor installed in the casing and compressing the air at high pressure by inducting the air; a combustor for mixing the air compressed by the compressor with a fuel and combusting the air mixed with the fuel; a turbine producing the power while rotating multiple turbine blades using combustion gas of the high pressure and high temperature discharged from the combustor; the pre-swirl system for swirling cooling air flowing into a lower end of the turbine blade; and an air inflow duct for supplying the cooling air discharged from the compressor to the pre-swirl system. The air inflow duct comprises the multiple partial ducts. The position or the area of an air flow unit in which the cooling air flows in the pre-swirl system is determined by corresponding to the position or the area in which the cooling air flows inside through the air inflow duct.
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