An ultrasound diagnostic apparatus for performing predetermined measurement with respect to carotid, a transmission unit for generating a transmission signal for transmitting ultrasound from the ultrasound probe to a subject, the ultrasonic probe the There a receiving unit that acquires a plurality of reception signals corresponding to one image frame based on the echo signal received, based on the signal strength of the received signal at each position in the depth direction, the position shown most vascular likeness 1 of the selection and the blood vessel candidate position, and the blood vessel candidate position selection unit to select the position that showed the most vascular likeness at a deeper position than the first vessel candidate position as the second of the blood vessel candidate position, the first of the blood vessel candidate positions and based on the signal strength in the second vessel candidate position, the tissue corresponding to the second vessel candidate positions is determined whether the blood vessel to the position relationship between the carotid artery and jugular vein in the judgment result and the depth direction according based on the information provided and the blood vessel location determining unit that either determines the position of the carotid artery, and a measurement region determining unit for setting a measurement region to perform the predetermined measurement based on the location of the determined carotid artery.頚動脈に対して所定の計測を行う超音波診断装置であって、超音波探触子から被検体に超音波を送信するための送信信号を生成する送信部と、超音波探触子が受信したエコー信号に基づき1枚の画像フレームに対応する複数の受信信号を取得する受信部と、深さ方向の各位置における受信信号の信号強度に基づき、最も血管らしさを示した位置を第1の血管候補位置と選定し、第1の血管候補位置よりも深い位置で最も血管らしさを示した位置を第2の血管候補位置として選定する血管候補位置選定部と、第1の血管候補位置および第2の血管候補位置における信号強度に基づき、第2の血管候補位置に対応する組織が血管であるか否かを判定し、その判定結果と深さ方向における頚動脈と頚静脈の位置関係に係る情報に基づき、いずれか一方を頚動脈の位置と決定する血管位置決定部と、決定した頚動脈の位置に基づき所定の計測を行う測定領域を設定する測定領域決定部とを備える。
