An apparatus for controlling ignition timing in an internal combustion engine includes a cam sensor for generating a standard position signal for each standard piston position, a position sensor for generating a single angle signal, a control unit for controlling ignition timing based on the standard position signal and the single angle signal, a timer for detecting a time from the standard position signal before the ignition timing, and a device for setting an ignition-starting timing after said standard position signal when an engine rotation speed is less than a predetermined rotation speed.