PROBLEM TO BE SOLVED: To provide an ultrasonic transducer and an ultrasonic endoscope that can prevent deformation due to aged deterioration.SOLUTION: An ultrasonic transducer includes: a first element capable of transmitting and receiving an ultrasonic wave； a second element provided adjacent to the first element, and capable of transmitting and receiving the ultrasonic wave； at least one acoustic matching layer laminated in the first element and the second element, respectively, and matching the sound impedance of first element and the second element with the sound impedance for observation； a sheet-like outer-most layer provided in the supersonic transmission direction to the acoustic matching layer, and holding an interval between the first element and the second element to a predetermined interval through the acoustic matching layer； the acoustic matching layer extending along the supersonic transmission direction, and between the first element and the second element and/or continuing to the first element； and a shape-retaining member having a tooth part entering between the acoustic matching layers continuing to the second element.SELECTED DRAWING: Figure 4COPYRIGHT: (C)2018,JPO&INPIT【課題】経年劣化による変形を抑制することができる超音波振動子および超音波内視鏡を提供すること。【解決手段】超音波を送受信可能な第１の素子と、第１の素子に隣り合って設けられており、超音波を送受信可能な第２の素子と、第１の素子および第２の素子にそれぞれ積層されており、第１の素子および第２の素子の音響インピーダンスと観測対象の音響インピーダンスとを整合する少なくとも一つの音響整合層と、音響整合層に対して超音波の送信方向に設けられており、音響整合層を介して第１の素子および第２の素子との間を所定の間隔に保持するシート状の最外層と、超音波の送信方向に沿って延出し、第１の素子と第２の素子との間、および／または第１の素子に連なる音響整合層と、第２の素子に連なる音響整合層との間に入り込んだ歯部を有する形状保持部材と、を備えた。【選択図】図４
