271 are provided for each injector 3 1 3 2 in the circuit configuration of embodiment 1 as compared with the circuit configuration of embodiment 1 the clamping voltage 320 is the same but the circuit configuration of embodiment 5 has the feature in which the heat generation amount per hour of the zener diodes 267 268 differs an internal combustion engine system usually rotates an output shaft thereof at as speed of several hundreds to several thousands r p m in accordance with the load amount thereof and the injector is driven in synchronism with the engine speed therefore considering a plurality of times of generation of clamping voltage 320 in a certain fixed time in which injection of the injector is performed a plurality of times there is provided the advantage that the heat generation amount of the zener diodes 267 268 which is the voltage regulating section in embodiment 5 can be suppressed to u00bd as compared with the heat generation amount of the zener diode 262 in embodiment 1 fig7 shows a circuit configuration of embodiment 6 of the internal combustion engine controller according to the present invention and the typical operation waveform of each of the parts thereof is shown in fig1 in embodiment 6 the connecting destination of the zener diode of the voltage regulating section is connected to the upstream side of the boost side current sensing resistor 201 that is to the boost voltage 100 a in the circuit configuration of embodiment 1 when a zener diode 272 as the voltage regulating section is added in series with the current.