An ignition control apparatus (507, 507a, 507b) at least comprising: a DC power source; a boosting circuit boosting a power source voltage of the DC power source; an ignition coil increasing and decreasing a current of a primary winding connected to the boosting circuit to generate a high secondary voltage in a secondary winding; and an ignition open/close element switching supply and interruption of current supply to the primary winding according to an ignition signal (IGt) generated according to an operating state of an engine, the ignition control apparatus being connected to the secondary winding to control an operation of an ignition plug that generates spark discharge in a combustion chamber of an internal combustion engine in response to application of a secondary voltage from the secondary winding characterized by an auxiliary power source performing discharge and non-discharge of current in a superposed manner at a connection point between the primary winding and the ignition open/close element from the boosting circuit from an ignition open/close element side of the primary winding after a lapse of a predetermined delay time (Td) from start of the discharge of the ignition plug by the open/close of the ignition open/close element to increase current passing through the secondary winding such that a discharge current for ignition discharge of the ignition plug is not repeatedly cleared to zero between a start and an end of ignition discharge in a single combustion stroke; an auxiliary open/close element switching discharge and non-discharge of current from the auxiliary power source; an auxiliary open/close element driving circuit (521, 521a, 521b) that drives open/close of the auxiliary open/close element; and a delay time calculating unit (210, 210a, 210b) delaying start of driving of the auxiliary open/close element by a predetermined delay time (Td) from an end position (falling) of the ignition signal (IGt) according to an engine parameter (EPr) that indicates an operating state of the internal combustion engine. a DC power source; a boosting circuit boosting a power source voltage of the DC power source; an ignition coil increasing and decreasing a current of a primary winding connected to the boosting circuit to generate a high secondary voltage in a secondary winding; and an ignition open/close element switching supply and interruption of current supply to the primary winding according to an ignition signal (IGt) generated according to an operating state of an engine, the ignition control apparatus being connected to the secondary winding to control an operation of an ignition plug that generates spark discharge in a combustion chamber of an internal combustion engine in response to application of a secondary voltage from the secondary winding characterized by an auxiliary power source performing discharge and non-discharge of current in a superposed manner at a connection point between the primary winding and the ignition open/close element from the boosting circuit from an ignition open/close element side of the primary winding after a lapse of a predetermined delay time (Td) from start of the discharge of the ignition plug by the open/close of the ignition open/close element to increase current passing through the secondary winding such that a discharge current for ignition discharge of the ignition plug is not repeatedly cleared to zero between a start and an end of ignition discharge in a single combustion stroke; an auxiliary open/close element switching discharge and non-discharge of current from the auxiliary power source; an auxiliary open/close element driving circuit (521, 521a, 521b) that drives open/close of the auxiliary open/close element; and a delay time calculating unit (210, 210a, 210b) delaying start of driving of the auxiliary open/close element by a predetermined delay time (Td) from an end position (falling) of the ignition signal (IGt) according to an engine parameter (EPr) that indicates an operating state of the internal combustion engine.