A solenoid valve system (10A, 10B) including a supply valve element opening and closing a supply channel that places an inlet port and an outlet port in communication, and a pilot valve portion configured to operate the supply valve element, the system comprising: a supply solenoid valve configured to control a flow rate of gas supplied to a pilot chamber of the pilot valve portion; a plurality of exhaust solenoid valves (16, 18) configured to control a flow rate of gas exhausted from the pilot chamber; and a valve control section configured to control opening and closing operation of the supply solenoid valve and the plurality of exhaust solenoid valves using PWM or PFM control, wherein the plurality of exhaust solenoid valves are disposed in parallel with each other, a number of the plurality of exhaust solenoid valves is twice a number of the supply solenoid valve; characterized by the supply solenoid valve and the plurality of exhaust solenoid valves having substantially identical flow rate characteristics, and by an operation mode setting section configured to set either a first operation mode where the plurality of exhaust solenoid valves open and close one time alternately or plural times alternately, or a second operation mode where the plurality of exhaust solenoid valves open and close simultaneously, wherein the valve control section is configured to control the opening and closing operation of the plurality of exhaust solenoid valves based on the operation mode set by the operation mode setting section; and a detection sensor (100, 210, 214) configured to detect a pressure or a flow rate of gas at the outlet port, wherein the operation mode setting section is configured to set the first operation mode when an absolute value of a deviation of a measured value obtained by the detection sensor from a set value is less than a predetermined threshold, and the operation mode setting section is configured to set the second operation mode when the absolute value of the deviation is greater than or equal to the predetermined threshold. a supply solenoid valve configured to control a flow rate of gas supplied to a pilot chamber of the pilot valve portion; a plurality of exhaust solenoid valves (16, 18) configured to control a flow rate of gas exhausted from the pilot chamber; and a valve control section configured to control opening and closing operation of the supply solenoid valve and the plurality of exhaust solenoid valves using PWM or PFM control, wherein the plurality of exhaust solenoid valves are disposed in parallel with each other, a number of the plurality of exhaust solenoid valves is twice a number of the supply solenoid valve; characterized by the supply solenoid valve and the plurality of exhaust solenoid valves having substantially identical flow rate characteristics, and by an operation mode setting section configured to set either a first operation mode where the plurality of exhaust solenoid valves open and close one time alternately or plural times alternately, or a second operation mode where the plurality of exhaust solenoid valves open and close simultaneously, wherein the valve control section is configured to control the opening and closing operation of the plurality of exhaust solenoid valves based on the operation mode set by the operation mode setting section; and a detection sensor (100, 210, 214) configured to detect a pressure or a flow rate of gas at the outlet port, wherein the operation mode setting section is configured to set the first operation mode when an absolute value of a deviation of a measured value obtained by the detection sensor from a set value is less than a predetermined threshold, and the operation mode setting section is configured to set the second operation mode when the absolute value of the deviation is greater than or equal to the predetermined threshold.