To inhibit the deterioration of a combustion condition by maintaining appropriate air fuel ratio by correcting fuel injection quantity according to temperature change of an injector in a fuel injection control device of an internal combustion engine.

A tip part of an injector 13 can be cooled by circulating fuel as cooling medium in the injector 13. When the tip part of the injector 13 is cooled by fuel, corrected fuel injection period T+T1 is calculated by adding an increment value T1 to fuel injection period T corresponding to predetermined base fuel injection quantity according to an operation condition of an engine 10 to control the injector 13.