IGNITION TIMING CONTROLLER FOR INTERNAL COMBUSTION ENGINE

The present invention is provided with: an injection timing detection unit (11); an engine rotation speed detection unit (131); an engine load detection unit; and a storing unit (11) for storing control data of the variation in optimal ignition timing with respect to engine speed and engine load, and control data of correction coefficient pertaining to optimal ignition timing with respect to the engine load at a specific fuel injection timing. Referring to the control data, the variation in the optimal ignition timing is determined based on the detected fuel injection timing and the detected engine rotation speed; and, referring to the control data, the variation in the optimal ignition timing is determined based on the specific fuel injection timing and the detected engine speed, and the deviation between the respective variation in the optimal injection timing is determined. Referring to the control data of correction coefficient, the correction coefficient with respect to the detected engine load at the specific fuel injection timing is determined; and the variation in the corrected optimal ignition timing is determined from the correction coefficient and the deviation in the optimal ignition timing.