The imaging ultrasonic image by transmitting and receiving ultrasonic waves for site comprising a carotid artery of a subject, an ultrasonic diagnostic apparatus may measure the thickness of the intima complex from the ultrasound image The ultrasonic diagnostic apparatus having a measuring unit thickness of, and the ultrasonic image a region of interest including the intima composite based on the concentration degree of the contour candidate points of the carotid artery by scanning the ultrasound image includes a region-of-interest setting unit that sets the upper, part of the thickness measurement is to measure the thickness of the intima complexes based on the bounds of the region of interest that is the set.本発明の超音波診断装置は、被検者の頸動脈部を含む部位に対し超音波を送受信して超音波画像を撮像し、該超音波画像から内膜中膜複合体の厚さを計測する厚さ計測部を有する超音波診断装置であって、前記超音波画像を走査し前記頸動脈の輪郭候補点の集中度に基づき前記内膜中膜複合体を含む関心領域を前記超音波画像上に設定する関心領域設定部を備え、前記厚さ計測部は、前記設定された関心領域中の境界に基づいて前記内膜中膜複合体の厚さを計測する。
