The purpose of the present invention is to provide a solar heat assisted gas turbine system the number of heat collecting devices of which is greatly reduced and for which the area of the site required to install the heat collecting devices is reduced. The present invention is characterized by being provided with the following: a compressor (1) for compressing air; a combustor (3) for combusting fuel and the air compressed by the compressor; a gas turbine device (100) comprising a turbine (2) driven by combustion gas generated by the combustor; a heat collecting device (200) for generating high pressure warm water by collecting solar heat; a heat storage chamber (57) for storing a medium to be heated after the temperature of the medium was raised; a heat exchanger (24) for generating warm water by performing heat exchange between a medium to be heated and water; and an injection device (300) for injecting the warm water generated by the heat exchanger into air taken into the compressor.
