PROBLEM TO BE SOLVED: To provide an ultrasonic diagnostic device capable of acquiring positional information on a puncture needle easily and more appropriately.SOLUTION: An ultrasonic diagnostic device comprises: a candidate region extraction part which extracts a plurality of detection candidate regions of a needle position range corresponding to the position of a puncture needle inserted to the interior of a subject (Q) from an ultrasonic image； a needle identification range setting part which defines a needle identification range (L) including the needle position range from the ultrasonic image on the basis of the plurality of extracted detection candidate regions； a needle position range estimation part which defines an estimated range of the needle position range in the needle identification range on the basis of a value indicating the assembly state related to the distribution of the plurality of detection candidate regions within the needle identification range； and a needle emphasis processing part which performs processing for emphasizing the estimated range in the ultrasonic image.SELECTED DRAWING: Figure 6【課題】容易、且つより適切に穿刺針の位置情報を取得することの出来る超音波診断装置を提供する。【解決手段】被検体内部（Ｑ）に刺入された穿刺針の位置に対応する針位置範囲の複数の検出候補領域を超音波画像から抽出する候補領域抽出部と、抽出された複数の検出候補領域に基づいて、超音波画像から針位置範囲を含む針同定範囲（Ｌ）を定める針同定範囲設定部と、針同定範囲内における複数の検出候補領域の分布に係る集合状態を示す値に基づいて、針同定範囲内における針位置範囲の推定範囲を定める針位置範囲推定部と、超音波画像における推定範囲を強調するための処理を行う針強調処理部と、を備える。【選択図】図６
