Fuel injection volume control apparatus

There will be provided a fuel injection volume control apparatus capable of supplying the proper amount of fuel by improving the response when the throttle opening is abruptly opened and the like, or by responding to a decrease in necessary fuel when the throttle opening is abruptly closed. There is provided a fuel injection volume control apparatus having control means ECU for determining a fuel injection time period in a fuel injection system on the basis of the engine speed and the throttle opening, characterized in that the control means ECU is equipped with means for determining a first fuel injection time period on the basis of the engine speed and the throttle opening to start fuel injection, and for correcting the fuel injection time period determined at the first time on the basis of changes in the engine speed and the throttle opening thereafter.