To provide an internal combustion engine capable of early starting the internal combustion engine while restraining discharge of HC.

Fuel is injected into an optional cylinder 21 the piston of which is at the bottom dead center or in a compression stroke from the bottom dead center at the time of detection after a piston position of each of the cylinders 21 is detected in starting of an internal combustion engine 1 having solenoid driving valve. A means to open an air intake valve 28 of the optional cylinder 21 according to fuel injection to supply fuel from an injector 32a arranged in an air intake pipe out of the cylinder and to inject fuel when the above piston position is at the bottom dead center or in the compression stroke from the bottom dead center is furnished.