provided is a noise filter circuit capable of outputting only a normal signal pulse in synchronization with a clock signal without passing the noise pulse on to a subsequent stage , even if a noise pulse having a width that is larger than a delay time is inputted . the noise filter circuit according to the present invention has a flip - flop additionally provided to a stage subsequent to a noise removing circuit that uses a delay circuit . the delay time of a clock signal inputted to the flip - flop is made different from the delay time of the noise removing circuit to thereby obtain a normal signal pulse to be outputted in synchronization with the clock signal .