A control device for an internal combustion engine (2) includes an electronic control unit (100) configured to switch a control algorithm for a calculation of a command value of an actuator between a first control algorithm and a second control algorithm. The electronic control unit (100) is configured to calculate a value obtained by adding a value of a term of the second control algorithm changing in accordance with the deviation calculated in a present control cycle to the command value calculated in a previous control cycle in accordance with the first control algorithm as a value of the command value calculated in the present control cycle in a first control cycle after switching from the first control algorithm to the second control algorithm. The value of the term changing in accordance with the deviation includes an update amount of an I term of the I control calculated in the present control cycle.