As for the ultrasonic observation device of this invention, two-dimensional scan of the ultrasonic beam is possible due to the ultrasonic probe section and the ultrasonic probe section whose control the sending and receiving direction of the ultrasonic beam generate the B mode image with respect to scan plane surface from the sending and receiving control section and the result of scan of the ultrasonic beam which deals with in the B mode image operation section and the suffering inspection body which according to the form of the disposal tool which is decided stores the specified sample picture which the storage section and operation the correlation value of the B mode image and the sample picture the correlation operation section which and, to have, as for the sending and receiving control section, correlation value largeIn order to become, scan plane surface is made to move.本発明の超音波観測装置は、超音波ビームの2次元走査が可能な超音波探触子部と、超音波探触子部による超音波ビームの送受信方向を制御する送受信制御部と、超音波ビームの走査の結果から走査平面上のBモード画像を生成するBモード画像演算部と、被検体に処置を行う処置具の形状に応じて定められた所定の見本画像を記憶する記憶部と、Bモード画像と見本画像との相関値を演算する相関演算部と、を備え、送受信制御部は、相関値が最も大きくなるように走査平面を移動させる。
