To avoid adhesion of deposit on a tip part of an injector in an engine injecting main fuel composed of one or both of gasoline and alcohol from an injector for cylinder injection.

This control device for the engine is provided with a main fuel supply system 13, an alcohol fuel supply system 17, a switching means 16, an injector tip temperature derivation means and a change over control means. The change over control means transmits signal to a change over means 16 according to tip temperature of an injector 4 and changes operation between an operation using main fuel and an operation using alcohol fuel. As a result, operation can be changed over to operation using alcohol fuel containing less high boiling point composition than main fuel when tip temperature of the injector 4 is temperature at which possibility of adhesion of deposit is high, and adhesion of deposit to the tip part of the injector 4 can be avoided.