PROBLEM TO BE SOLVED: To provide an ultrasonic endoscope capable of preventing a body cavity wall from coming into close contact with an observation window when causing the body cavity wall to come into close contact with an ultrasonic transducer, and reliably performing observation by an optical image.SOLUTION: An ultrasonic endoscope includes: an ultrasonic transducer 50 having an ultrasonic vibrator a tip body 36 connected to the proximal end side of the ultrasonic transducer 50 a treatment instrument derivation part provided to the tip body 36, which includes a treatment instrument derivation port 80 from which the treatment instrument is derived an observation means forming surface 72 provided at a position adjacent to the treatment instrument derivation part of the tip body 36, which includes a normal component heading for a tip side in an axial direction of the tip body 36 an observation window 44 disposed on the observation means forming surface 72 for observing a subject and a close contact preventive projection 84 formed in the periphery of the observation window 44 so as to project from the observation means forming surface 72 for preventing the subject from coming into close contact with the observation window 44.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2019,JPO&INPIT【課題】超音波トランスデューサに体腔壁を密着させた際に、観察窓に体腔壁が密着することを防止し、光学画像による観察を確実に行うことができる超音波内視鏡を提供する。【解決手段】超音波振動子を有する超音波トランスデューサ50と、超音波トランスデューサ50の基端側に連設された先端部本体36と、先端部本体36に設けられた処置具導出部であって、処置具が導出される処置具導出口80を有する処置具導出部と、先端部本体36の前記処置具導出部に隣接する位置に設けられ、先端部本体36の軸線方向の先端側に向かう法線成分を有する観察手段形成面72と、観察手段形成面72に配設され被検体を観察する観察窓44と、観察窓44の周囲に観察手段形成面72から突出して形成され、観察窓44への被検体の密着を防止する密着防止用突出部84と、を備える超音波内視鏡である。【選択図】図2
