To provide a control device for an internal combustion engine capable of promoting increase in energy of exhaust gas while preventing output of the internal combustion engine from greatly fluctuating when supercharging promotion is required in the internal combustion engine having a supercharger.

This control device for an internal combustion engine controls the internal combustion engine having the supercharger 30. The control device is provided with gas supply means 10 and 14 supplying gas at a pressure relatively higher than that inside a cylinder into the cylinder of the internal combustion engine. In either of an expansion stroke and an exhaust stroke of the internal combustion engine, the gas is fed into the cylinder by the gas supply means. The gas supplied into the cylinder may be, for example, air.