According to one embodiment, a noise reducing circuit includes a frame memory configured to frame-delay a video signal, a first arithmetic unit configured to subtract the frame-delayed video signal given by the frame memory from the video signal to output a first frame difference signal, a first rectangular wave removing unit configured to remove a rectangular wave component from the first frame difference signal to generate a second frame difference signal, a first pulse discriminating unit configured to receive the second frame difference signal, remove a continuous pulse component from the second frame difference signal, and output a single pulse component, and a second arithmetic unit configured to subtract the single pulse component from the video signal.