For the purpose of acquiring three-dimensional data for a contrast-enhanced image at an appropriate scan plane distance even for a different moving rate of an ultrasonic probe or for a different subject or imaged region, an ultrasonic diagnostic apparatus comprises: an image producing section for producing an image based on received data obtained from one scan plane; a correlation value calculating section for calculating a correlation value between images; a low-MI scan control section for repeatedly conducting a scan with such a low MI value as not break contrast agent until a correlation value between an initial image and a current image becomes smaller than a threshold; and a high-MI scan control section for, when the correlation value becomes smaller than the threshold, capturing one image with such a high MR value as to break contrast agent and returning control to the low-MI scan control section.