It is an object of the present invention to provide a solar assisted gas turbine system that has a largely reduced number of heat collectors and a reduced installation area required for installation of the heat collectors. The solar assisted gas turbine system of the invention includes a gas turbine unit having a compressor for compressing air, a combustor for putting the air compressed by the compressor and a fuel into combustion, and a turbine driven by a combustion gas generated in the combustor; a heat collector for collecting solar heat and forming high-pressure hot water; a heat storage tank for storing the heating medium raised in temperature; a heat-exchanger for performing heat exchange between the heating medium and water to form hot water; and an atomizer by which the hot water formed by the heat-exchanger is sprayed into the air to be taken into the compressor.