A solar/air turbine generator system comprising: a compressor for drawing in and compressing air; a solar receiver for heating the air compressed by the compressor with the use of solar heat collected by a solar collector; an air turbine for driving the compressor and a generator by receiving the compressed air heated by the solar receiver; a regenerative heat exchanger, located downstream of the compressor and upstream of the solar receiver, for heating the air compressed by the compressor using the exhaust of the air turbine as a heating medium; and a distribution device, located downstream of the compressor and upstream of the regenerative heat exchanger, for distributing the air compressed by the compressor to the side of the regenerative heat exchanger and to a bypass side, the bypass side being the inlet side of the air turbine, wherein the solar/air turbine generator system further includes a control device for maintaining the air temperature at the inlet of the air turbine at a constant value by adjusting the flow rate of the air turbine exhaust that flows into the regenerative heat exchanger as a heating medium, characterized in that the system further comprises: a regenerative heat exchanger inflow system for directing the exhaust of the air turbine to the regenerative heat exchanger; a regenerative heat exchanger bypass system for causing the exhaust of the air turbine to bypass the regenerative heat exchanger; and a flowrate adjusting valve for adjusting the flow rate of the exhaust flowing into the regenerative heat exchanger bypass system, a first temperature sensor for detecting the air temperature at the inlet of the air turbine; wherein the control device reads the air turbine inlet air temperature detected by the first temperature sensor and controls the opening degree of the flowrate adjusting valve such that the air turbine inlet air temperature is maintained at constant value. a compressor for drawing in and compressing air; a solar receiver for heating the air compressed by the compressor with the use of solar heat collected by a solar collector; an air turbine for driving the compressor and a generator by receiving the compressed air heated by the solar receiver; a regenerative heat exchanger, located downstream of the compressor and upstream of the solar receiver, for heating the air compressed by the compressor using the exhaust of the air turbine as a heating medium; and a distribution device, located downstream of the compressor and upstream of the regenerative heat exchanger, for distributing the air compressed by the compressor to the side of the regenerative heat exchanger and to a bypass side, the bypass side being the inlet side of the air turbine, wherein the solar/air turbine generator system further includes a control device for maintaining the air temperature at the inlet of the air turbine at a constant value by adjusting the flow rate of the air turbine exhaust that flows into the regenerative heat exchanger as a heating medium, characterized in that the system further comprises: a regenerative heat exchanger inflow system for directing the exhaust of the air turbine to the regenerative heat exchanger; a regenerative heat exchanger bypass system for causing the exhaust of the air turbine to bypass the regenerative heat exchanger; and a flowrate adjusting valve for adjusting the flow rate of the exhaust flowing into the regenerative heat exchanger bypass system, a regenerative heat exchanger inflow system for directing the exhaust of the air turbine to the regenerative heat exchanger; a regenerative heat exchanger bypass system for causing the exhaust of the air turbine to bypass the regenerative heat exchanger; and a flowrate adjusting valve for adjusting the flow rate of the exhaust flowing into the regenerative heat exchanger bypass system,