Ultrasound probe capable of propagation efficiency of the ultrasonic wave is high, and obtains an ultrasound diagnostic image with a high resolution A (102), a piezoelectric element for generating ultrasonic ultrasonic transducer, and (208) , and a matching layer first to be arranged in a predetermined direction as viewed piezoelectric from (208) performs acoustic matching with the subject 208 and the piezoelectric element and (101), matching layer first (101 In), a predetermined thickness direction is constant, (101a, 101b matching areas including a plurality of alignment regions at least two that are arranged in a direction perpendicular to the predetermined direction, the frequency characteristic of the transmission of the ultrasonic wave is different , I have a 101c).超音波の伝播効率が高く、かつ、解像度の高い超音波診断画像を取得することができる超音波プローブ(102)であって、超音波振動子は、超音波を発生させる圧電体(208)と、圧電体(208)から見て所定方向に配置され、圧電体(208)と被検体との音響整合を行うための第一の整合層(101)とを備え、第一の整合層(101)は、所定方向の厚さが一定であり、所定方向に垂直な方向に配列された、超音波の透過率の周波数特性が互いに異なる少なくとも2つの整合領域を含む複数の整合領域(101a、101b、101c)を有する。
