An ECU of an internal combustion engine estimates an anticipated air amount in response to a demand for the internal combustion engine and causes an injector to inject an initial amount of fuel determined in accordance with the anticipated air amount so that an air-fuel ratio of a mixture in a combustion chamber is lower than a target value, and thereafter, calculates an amount of intake air aspired into the combustion chamber based on an in-cylinder pressure in the combustion chamber at a given timing during a compression stroke and before ignition, and causes the injector to inject a correction amount of fuel determined based on the calculated amount of the intake air and the initial amount of the fuel so that the air-fuel ratio of the mixture in the combustion chamber corresponds to the target value.