The ultrasonic probe, and its production manner which possess the signal conductor which prevents the generation of the acoustic crosstalk of the piezo-electric device which forms piezo-electric device array are offered. Laminating in 1st piezo-electric device array, and the aforementioned 1st piezo-electric device array where the 1st piezo-electric device possessing the electrode in both sides is arrayed into two-dimensional condition it is laid out, possesses the 1st electrode on the surface of opposite side, to aforementioned 1st piezo-electric device array it provides the acoustic separable section between the 1st piezo-electric devices which are arrayed into aforementioned 1st piezo-electric device array the 2nd piezo-electric device array where the 2nd piezo-electric device which possesses the 2nd electrode on the surface of 1st piezo-electric device array side is arrayed into two-dimensional condition and, in the ultrasonic probe which it possesses, penetrating completely the aforementioned acoustic separable sectionDoing, the aforementioned 2nd electrode it is jointed respectively, the signal conductor which consists of the conductive formation which facilities is done and, it provides according to the core material and the said core material rim which possess abbreviation equal acoustic impedance in acoustic impedance of the aforementioned acoustic separable section.圧電素子アレイを構成する圧電素子同士の音響的クロストークの発生を防止した信号線を有する超音波探触子、及びその作製方法を提供する。両面に電極を有する第１圧電素子が２次元状に配列された第１圧電素子アレイと、前記第１圧電素子アレイに積層して配置され、前記第１圧電素子アレイと反対側の面に第１電極を有し、第１圧電素子アレイ側の面に第２電極を有する第２圧電素子が２次元状に配列された第２圧電素子アレイと、を有する超音波探触子において、前記第１圧電素子アレイに配列された第１圧電素子の間に音響分離部を設け、前記音響分離部を貫通して前記第２電極それぞれに接続され、前記音響分離部の音響インピーダンスに略等しい音響インピーダンスを有する芯材と、該芯材外周に沿って覆設された導電性層からなる信号線と、を設ける。
