PROBLEM TO BE SOLVED: To provide an ultrasonic diagnostic apparatus which conveniently generates ultrasonic image data with high azimuthal resolution in accordance with a depth by a simple circuit structure and with high power supply efficiency.SOLUTION: A transmission part 12, in accordance with an acquisition depth of the ultrasonic image data set by a control part, sets output timing of transmission ultrasound of a plurality of transducers 21a respectively by having n pieces of the adjacent transducers 21a out of the plurality of the transducers 21a as one set so as to switch the amount of shift of the phase of the transmission ultrasound within the set at least between a first phase amount to emphasize a frequency component that is n times as large as a base wave component by reducing the base wave component contained in the transmission ultrasound and a second phase amount to emphasize the base wave component.COPYRIGHT: (C)2012,JPO&INPIT【課題】深度に応じた方位分解能の高い超音波画像データを、簡素な回路構成にて、簡便で、電源効率よく生成することができる超音波診断装置を提供する。【解決手段】送信部12は、制御部によって設定された超音波画像データの取得深度に応じて、複数の振動子21aのうちの隣接するn個の振動子21aを1組として、当該組内における送信超音波の位相のずれ量が、すくなくとも送信超音波に含まれる基本波成分を低減させて基本波成分のn倍の周波数成分を強調するための第1の位相量と、基本波成分を強調するための第2の位相量とに切り替わるように、複数の振動子21aの送信超音波の出力タイミングをそれぞれ設定する。【選択図】図3
