An ultrasound image diagnostic apparatus for capturing an image of a subject into which a puncture needle is inserted, the apparatus comprising: an ultrasound probe to transmit ultrasound waves to the subject in response to received pulse signals and output response signals in response to received echoes from the subject; a transmitter to repeat alternating supply of first pulse signals and second pulse signals to the ultrasound probe, the second pulse signals being generated by polarity inversion of the first pulse signals; a receiver to receive the response signals from the ultrasound probe and generate sound ray data; a memory to store first sound ray data corresponding to the first pulse signals; a harmonic sound ray data generator to generate harmonic sound ray data based on the stored first sound ray data and second sound ray data corresponding to the second pulse signals; a line-signal processor to generate harmonic line data from the generated harmonic sound ray data; a harmonic image generator to generate harmonic image data from the generated harmonic line data; characterized in that the line-signal processor is configured to generate fundamental line data from the first sound ray data, the apparatus further comprising: a fundamental image generator to generate fundamental image data from the generated fundamental line data; a needle image generator to generate needle image data from the generated fundamental image data, the needle image data including an emphasized needle area corresponding to the puncture needle; a synthesizer to generate synthesized image data through combining the generated needle image data and the generated harmonic image data; and a display controller to control a display to display the generated synthesized image data. an ultrasound probe to transmit ultrasound waves to the subject in response to received pulse signals and output response signals in response to received echoes from the subject; a transmitter to repeat alternating supply of first pulse signals and second pulse signals to the ultrasound probe, the second pulse signals being generated by polarity inversion of the first pulse signals; a receiver to receive the response signals from the ultrasound probe and generate sound ray data; a memory to store first sound ray data corresponding to the first pulse signals; a harmonic sound ray data generator to generate harmonic sound ray data based on the stored first sound ray data and second sound ray data corresponding to the second pulse signals; a line-signal processor to generate harmonic line data from the generated harmonic sound ray data; a harmonic image generator to generate harmonic image data from the generated harmonic line data; characterized in that the line-signal processor is configured to generate fundamental line data from the first sound ray data, the apparatus further comprising: a fundamental image generator to generate fundamental image data from the generated fundamental line data; a needle image generator to generate needle image data from the generated fundamental image data, the needle image data including an emphasized needle area corresponding to the puncture needle; a synthesizer to generate synthesized image data through combining the generated needle image data and the generated harmonic image data; and a display controller to control a display to display the generated synthesized image data. a fundamental image generator to generate fundamental image data from the generated fundamental line data; a needle image generator to generate needle image data from the generated fundamental image data, the needle image data including an emphasized needle area corresponding to the puncture needle; a synthesizer to generate synthesized image data through combining the generated needle image data and the generated harmonic image data; and a display controller to control a display to display the generated synthesized image data.