The control unit (10) of the abnormal tissue detection device (1) includes a combination (Tx1-Rx1, ...) in which the relative distance between the transmission antenna and the reception antenna in the antenna array in which a plurality of transmission antennas and reception antennas are arranged is the same. , Tx8−Rx8) for each set average waveform pattern (42), the deviation of the signal waveform in the time direction is adjusted based on the peak point in the signal waveform of the received signal received by the receiving antenna (time adjustment). And a control part (10) produces generates the same distance average waveform pattern (43) which shows the average of the signal waveform of the received signal in the combination with the same relative distance of a transmitting antenna and a receiving antenna. A difference waveform pattern (45) indicating a difference between the same distance average waveform pattern (43) and the total signal average waveform pattern (44) in the combination in which the relative distance between the transmission antenna and the reception antenna is the same is generated.異常組織検出装置（１）の制御部（１０）は、複数の送信アンテナ、受信アンテナが配列されたアンテナアレイ中の送信アンテナと受信アンテナとの相対距離が同じ組み合わせ（Ｔｘ１－Ｒｘ１、・・・、Ｔｘ８－Ｒｘ８）の組毎平均波形パターン（４２）について、受信アンテナで受信された受信信号の信号波形におけるピークの時点に基づいて、信号波形の時間方向のずれを調整する（時間調整）。そして、制御部（１０）は、送信アンテナと受信アンテナとの相対距離が同じ組み合わせにおける受信信号の信号波形の平均を示す同距離平均波形パターン（４３）を生成する。送信アンテナと受信アンテナとの相対距離が同じ組み合わせにおける同距離平均波形パターン（４３）と、全信号平均波形パターン（４４）との差分を示す差分波形パターン（４５）が生成される。
