To strike a balance between fuel combustion stabilization in a combustion chamber of a cylinder and effective improvement of fuel consumption.

In a device of controlling a spark ignition type internal combustion engine, an electric field produced in a combustion chamber of a cylinder via an antenna facing the inside of the combustion chamber and spark discharge generated between a center electrode and an earth electrode of an ignition plug interact with each other to produce plasma in the combustion chamber, active firing can be performed which fires air-fuel mixture, and in addition an EGR device is attached in which part of exhaust flows back and mixes in intake air. Fuel consumption that can be reduced by an increase in an EGR gas amount caused by performance of the active firing, and fuel consumption required for covering electric power consumed by the active firing are calculated, and the active firing is performed under the condition that the former exceeds the latter.