Abstract: A fuel injection equipment for an internal combustion engine capable of reducing a variation in fuel injection time due to a variation in power supply voltage. An injector is incorporated which is constructed so as to exhibit characteristics which permit ineffective time consumed between start of flowing of an exciting current and actual opening of a valve to converge on a constant value while being gradually reduced with an increase in driving voltage. The driving voltage is set to be a value increased sufficient to permit a ratio of variation of the ineffective time to the driving voltage to be within a tolerance.