To provide an internal combustion engine capable of improving the fuel consumption ratio and a torque fluctuation in an engine.

This internal combustion engine has a piston, a cylinder for storing the piston, an intake port and an exhaust port connected in the cylinder, an intake valve for opening and closing the intake port and an exhaust valve for opening and closing the exhaust port, and an injector for injecting fuel into a combustion chamber of the cylinder. The injector is arranged on the cylinder bore side on the intake port side. An injection prohibiting period Tioff is arranged for prohibiting fuel injection of the injector, and valve opening time Tva of the exhaust valve is positioned in the injection prohibiting period Tioff of the injector.