An igniter of the present invention has an insulated gate semiconductor
device having a collector terminal, an emitter terminal and a gate
terminal, a current control circuit which limits current by controlling
voltage at the gate terminal when current for flowing through the
insulated gate semiconductor device exceeds a fixed value, a voltage
monitor circuit for detecting a potential of the collector, and a control
current adjusting circuit for controlling current which flows through the
gate terminal by receiving output from the voltage monitor circuit.