PURPOSE: To photograph an ultrasonic image of high quality with ultrasonic waves of a low sound pressure, which does not decompose a contrast medium until the contrast medium is distributed in a part to be photographed when ultrasonic scanning is performed with the contrast medium. CONSTITUTION: In intermittent scanning, the scanning is performed with an ultrasonic wave in which the predetermined modulation is applied to the ultrasonic wave of a sound pressure which does not decompose the contrast medium during a pause period until the contrast medium is distributed in a part to be photographed, an echo receiving signal is pulse compressed and an image is formed based on the echo receiving signal after pulse compression.
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