To obtain a control device for a four-cycle internal combustion engine in which abnormality is not caused in the engine operation especially at the time of starting in the cases of simultaneous injection control for an injector and simultaneous ignition control for an ignition cylinder group.

A control device of a four-cycle internal combustion engine comprises an angle detector for detecting the rotating angle of a four-cycle internal combustion engine in synchronization with the rotation of the 4-cycle internal combustion engine, injectors for injecting fuel provided on each cylinder of the 4-cycle internal combustion engine, plural ignition coils for generating high voltage for ignition corresponding to each of the cylinders, a fuel injection control part for forcing the injectors to simultaneously inject fuel at each cylinder, and an ignition control part for applying high voltage from the ignition coils to the ignition plug to be controlled to simultaneously discharge to the cylinder group of ignition. The fuel injection control part injects fuel after a designated range from the control timing of the ignition coils (S12-S14).