Abstract: A control device for a two-cycle internal combustion engine combustion engine of the fuel injection type, which is provided with an ignition control device and a fuel control device, wherein the fuel control device includes an injection mode-controlling means for controlling a timing of fuel injection by selecting a particular fuel injection mode, i.e. selecting the mode from a one-injection per revolution mode where the injection of fuel is performed on every revolution of a crank shaft of the internal combustion engine and a thinned-out injection mode where the injection of fuel is performed on plural revolutions of the crank shaft. The fuel control device is provided also with an injection quantity-controlling means for controlling the quantity of fuel to be injected.