PURPOSE: To simplify the structure of an apparatus for controlling fuel injection for cylinders independently from each other, by disposing the pressure take-out port of a pressure sensor for detecting the pressure in an intake pipe at a small- opening position of a throttle valve, and thereby discriminating cylinders with each by use of a pressure sensor.

CONSTITUTION: A pressure take-out port of a pressure sensor 13 is disposed at a small-opening position of a throttle valve 11, and the pressure sensor 13 detects the pressure in an intake pipe 10. A crank-angle sensor 14 detects the turning angle of a crankshaft. A controller 6 has a sample hold circuit and a cylinder discriminating circuit and controls an injector 5 and an ignition plug 27 of each cylinder. By the injector 5 provided for each cylinder, fuel is injected to the cylinder when it is in the process of suction stroke. Thus, since the cylinders can be discriminated with ease by use of the pressure sensor, it is enabled to simplify the structure of an apparatus for controlling fuel injection for each cylinder independently from each other.