PURPOSE: To effect stable multiple ignitions by generating repeating output signals to flow a primary current for an ignition coil during only a predetermined period of time in a multiple ignitions control circuit whenever an secondary current becomes below a predetermined value.

CONSTITUTION: An alternative signal is generated in an ignition signal generater 8 in accordace with a revolution of an internal-combustion engine. This signal is imposed to a base of a power transistor 1b through a signal processing circuit 9 and a logical operation circuit 7, and a primary current of an ignition coil 5 is supplied or cut, thereby, an ignition spark is generated in an ignition plug 4. A secondary current is detected by a secondary current detecting resistor 1a and in case it is lowered below a standard value, the primary current of the ignition coil 5 is controlled by a single-stabilized multi-vibrator 6, and thereby, whenever the secondary current is lowered below the predetermined value, multiple ignitions may be effected during a predetermined period of time.