PROBLEM TO BE SOLVED: To make it possible to easily place a probe in an appropriate position relative to a living body during an ultrasonic diagnosis.SOLUTION: An ultrasonic diagnostic apparatus is an ultrasonic diagnostic apparatus 100 configured connectable with a probe 1 having a plurality of oscillators. The ultrasonic diagnostic apparatus 100 comprises: an ultrasonic signal processing unit 2 which performs the transmission processing for generating transmission control signals to transmit ultrasonic waves from the probe 1 to a living body and the reception processing for obtaining reception signals based on reflected ultrasonic waves received by the probe a flow rate analysis unit 4 which calculates the flow rate of a fluid flowing at least two measurement points in the living body, i.e. a first measurement point and a second measurement point in the living body, on the basis of the reception electric signals obtained from the probe and a reliability judgment unit 5 which compares the flow rate of the fluid at the first measurement point with that at the second measurement point.COPYRIGHT: (C)2015,JPO&INPIT【課題】超音波診断において探触子を生体に対して適正な位置に簡便に配置できるようにする。【解決手段】超音波診断装置は、複数の振動子を有する探触子1が接続可能に構成される超音波診断装置100であって、探触子1から被検体に超音波を送信するための送信制御信号を生成する送信処理と探触子が受信した反射超音波に基づく受信信号を取得する受信処理とを行う超音波信号処理部2と、探触子から得られる受信電気信号に基づいて、被検体のうち少なくとも2箇所の測定点である第1の測定点及び第2の測定点の被検体内を流れる流体の流速を算出する流速解析部4と、第1の測定点における流体の流速と第2の測定点における流体の流速を比較する信頼性判定部5とを備える。【選択図】図1