A gate driving device which is configured to drive a gate of an active element with a large input capacitance, the device comprising: a first switch portion which is provided between a high potential side first power supply line and an output terminal connectable to the gate of the active element and which is configured to turn on the active element; a second switch portion which is connected between the output terminal connectable to the gate of the active element and a low potential side second power supply line and which is configured to turn off the active element; a current control portion which is provided in parallel with the second switch portion and which is configured to control outflow of charge on the gate of the active element to the second power supply line such that a collector current that flows in the active element is constant; and a second protection circuit which is provided between the current control portion and the second power supply line and which is configured to detect a prescribed fluctuation in an applied voltage between the first power supply line and the second power supply line, and when the fluctuation is detected, interrupt the connection between the current control portion and the second power supply line, the device characterized by further comprising a first protection circuit which is provided between the first switch portion and the output terminal connectable to the gate of the active element and which is configured to suppress outflow of charge on the gate of the active element to the first power supply line, wherein only the first switch portion and the first protection circuit are provided between the first supply line and the output terminal connectable to the gate of the active element. a first switch portion which is provided between a high potential side first power supply line and an output terminal connectable to the gate of the active element and which is configured to turn on the active element; a second switch portion which is connected between the output terminal connectable to the gate of the active element and a low potential side second power supply line and which is configured to turn off the active element; a current control portion which is provided in parallel with the second switch portion and which is configured to control outflow of charge on the gate of the active element to the second power supply line such that a collector current that flows in the active element is constant; and a second protection circuit which is provided between the current control portion and the second power supply line and which is configured to detect a prescribed fluctuation in an applied voltage between the first power supply line and the second power supply line, and when the fluctuation is detected, interrupt the connection between the current control portion and the second power supply line, the device characterized by further comprising a first protection circuit which is provided between the first switch portion and the output terminal connectable to the gate of the active element and which is configured to suppress outflow of charge on the gate of the active element to the first power supply line, wherein only the first switch portion and the first protection circuit are provided between the first supply line and the output terminal connectable to the gate of the active element.