Control device for internal combustion engine

An object of this invention is to provide a control device for an internal combustion engine that can calculate a combustion noise index having a strong correlation with combustion noise based on information of one cycle, and execute control that suppresses combustion noise with a high level of responsiveness. The control device includes: in-cylinder pressure acquisition means for acquiring an in-cylinder pressure; in-cylinder pressure change rate calculation means for calculating an in-cylinder pressure change rate that is an amount of increase in the in-cylinder pressure per unit time or unit crank angle based on each in-cylinder pressure acquired by the in-cylinder pressure acquisition means in a combustion period during one cycle; integrated value calculation means for calculating an integrated value by integrating in-cylinder pressure change rates that are equal to or greater than a noise threshold value that is equal to or greater than 0 or is a negative value close to 0 with respect to the respective in-cylinder pressure change rates calculated by the in-cylinder pressure change rate calculation means; and combustion noise suppression control means for executing control that suppresses combustion noise based on the integrated value calculated by the integrated value calculation means.