PROBLEM TO BE SOLVED: To provide an ultrasonic endoscope capable of reducing noise and suppressing an increase in the diameter of an insertion part in a configuration having a radial type ultrasonic vibrator, a forward-view optical system, and a channel.SOLUTION: An ultrasonic endoscope includes: an insertion part having a distal end hard part, a bent part, a flexible tube part a radial type ultrasonic vibrator an imaging part for imaging a forward visual field in a longitudinal direction of the insertion part a channel, one end of which is open at the tip in a longitudinal direction of the distal end hard part and an ultrasonic cable having a plurality of coaxial lines electrically connected to a plurality of piezoelectric elements respectively, a metallic comprehensive shield covering the plurality of coaxial lines, and an insulating jacket for covering the comprehensive shield, the jacket reaching the base end side of the distal end hard part from the flexible tube part through the bent part in a state of covering the plurality of coaxial lines, and being fixed to the base end side near the outer periphery of the distal end hard part.SELECTED DRAWING: Figure 5COPYRIGHT: (C)2019,JPO&INPIT【課題】ラジアル型の超音波振動子と、前方視光学系と、チャンネルとを備えた構成において、ノイズを低減し、かつ挿入部の太径化を抑制することができる超音波内視鏡を提供すること。【解決手段】先端硬質部と、湾曲部と、可撓管部とを有する挿入部と、ラジアル型の超音波振動子と、挿入部の長手方向の前方の視野の画像を撮像する撮像部と、一端が先端硬質部の長手方向の先端に開口するチャンネルと、複数の圧電素子とそれぞれ電気的に接続する複数の同軸線と、該複数の同軸線を被覆する金属製の総合シールド、および総合シールドを被覆する絶縁性のジャケットを有し、ジャケットが、複数の同軸線を被覆した状態で可撓管部から湾曲部を経て先端硬質部の基端側に達するとともに、先端硬質部の基端側かつ外周寄りに固定されている超音波ケーブルと、を備える。【選択図】図5
