<p>[PROBLEMS] To provide an ultrasonic breast diagnostic system suitable for screening of breast cancer and minimizing the burden on the doctor examining the captured image. [MEANS FOR SOLVING PROBLEMS] An ultrasonic breast diagnostic system comprises an ultrasonic breast imaging apparatus (10) having a water bath (11) into which left and right breasts can be dipped downward and an ultrasonic probe (12) so disposed on the bottom of the water bath (11) to mechanically scan and adapted to three-dimensionally image the whole region of the breasts by transmitting/receiving an ultrasonic wave, a breast voxel data creating device (20) for creating voxel data on the entire breasts from image data (A) acquired by the apparatus (10), and an examination image display (30) for displaying an image for examination from the past voxel data and present voxel data on the breasts of the same subject created by the device (20) which displays the tomograms in a predetermined direction of the present breasts to be examined at predetermined pitches from one end to the other sequentially and the past tomogram at the cross-section position corresponding to the present one side by side.</p>
