PURPOSE: To obtain always a stabilized ignition timing by generating a first angle signal, corresponding to a prdetermined crank position, and the second angle signal, properly delayed from the first signal, and operating the ignition timing with the first signal while obtaining an ignition signal in accordance with the second signal.

CONSTITUTION: A capacitor 4 is connected to a power generating coil 1 through a commutating diode 2 and an ignition coil 5 is connected to the discharging circuit. Discharge of the capacitor 4 is effected upon a thyristor 7 is connected. A signal coil 8 for generating ignition signals, which is operating as an angular position detecting device, generates a first angle signal a, corresponding to a predetermined crank position of an engine, and the second angle signal b corresponding to a crank position delayed by θ° from the first signal a generating position. Here, an ignition timing, in accordance with an operating condition of the engine, is operated in an ignition timing operating circuit 15 with the first angle signal a, and the thyristor 7 is controlled by a result thereof and a signal obtained by the signal b.