PURPOSE: To provide a gas-turbine control device in which the reignition after the stoppage of fuel supply is securely carried out.

CONSTITUTION: A regenerative gas turbine equipped with a heat exchanger by which the compressed air being sent from a compressor to a combustor is heated by the heat of exhaust gas being discharged from a turbine is provided with a fuel supply means 1 for feeding fuel to the combustor, a fuel supply stopping means 2 for temporarily stopping the supply of fuel in accordance with the operating conditions, a fuel supply restarting means 3 for restarting the supply of fuel in accordance with the operating conditions and carrying out reignition, and a grain size increasing means 4 by which the grain size of the atomized fuel to be supplied to the combustor is increased at the time of reignition when the supply of fuel is restarted.