PROBLEM TO BE SOLVED: To provide an ultrasonic diagnosis device capable of effectively reducing noise included in a reception signal even when a phase of the noise included in the reception signal is different in each circuit board.SOLUTION: An ultrasonic diagnosis device 1 includes a plurality of reception elements 15 for receiving an ultrasonic wave, converting it to an electric signal, and outputting a reception signal, a first amplifier 16 for detection for detecting noise and outputting a noise signal, a second amplifier 21 for detection for amplifying the noise signal and outputting an amplified noise signal, a subtracting amplifier 22 for inputting the reception signal and the amplified noise signal, and subtracting the amplified noise signal from the reception signal, and a plurality of pretreatment boards 9 equipped with the second amplifier 21 for detection and the subtracting amplifier 22.SELECTED DRAWING: Figure 2【課題】回路基板毎に受信信号に含まれるノイズの位相が異なるときにも効果的に受信信号に含まれるノイズを低減することができる超音波診断装置を提供する。【解決手段】超音波診断装置１は超音波を受信し電気信号に変換して受信信号を出力する複数の受信素子１５と、ノイズを検出してノイズ信号を出力する検出用第１増幅アンプ１６と、ノイズ信号を増幅し増幅ノイズ信号を出力する検出用第２増幅アンプ２１と、受信信号及び増幅ノイズ信号を入力し受信信号から増幅ノイズ信号を減算する減算アンプ２２と、検出用第２増幅アンプ２１及び減算アンプ２２を備える複数の前処理基板９と、を備える。【選択図】図２
