One end of each of the acoustic matching layer 2 having a predetermined curvature, the plurality of piezoelectric elements 3 curved and arranged on the inner surface 2n on the curvature center C side of the acoustic matching layer 2, and the plurality of piezoelectric elements 3. A plurality of wirings 9 electrically connected, a substrate 5 to which the other ends of the plurality of wirings 9 are respectively electrically connected, and a midway position of the plurality of wirings 9 between the plurality of piezoelectric elements 3 and the substrate 5 And a holding member 4 that holds the plurality of wirings 9 at an interval W2 that is less than or equal to the arrangement interval W1 of the plurality of piezoelectric elements 3.所定の曲率を有して湾曲する音響整合層２と、音響整合層２の曲率中心Ｃ側の内面２ｎに湾曲して配置された複数の圧電素子３と、複数の圧電素子３にそれぞれ一端が電気的に接続された複数の配線９と、複数の配線９の他端がそれぞれ電気的に接続された基板５と、複数の圧電素子３と基板５との間における複数の配線９の中途位置に設けられた、複数の配線９を、複数の圧電素子３の配列間隔Ｗ１以下の間隔Ｗ２に保持する保持部材４と、を具備する。
