Provided is an ultrasonic endoscope capable of observing up to a proximal end side of a treatment tool in an observation field of view of an observation window. A distal end hard portion 34 provided at the distal end of the insertion section 12, an ultrasonic transducer 50 disposed on the distal end hard portion 34, and a base end side of the ultrasonic transducer 50, which is opened at one side in the first direction. An erecting table housing 62 having an opening 58 as a direction, an opening forming surface 70 in which the opening 58 is formed, and a treatment tool erecting table provided inside the erecting table housing 62 to change the direction in which the treatment tool is drawn out. 60, and an observation window 44 provided on the observation means forming surface 72 provided on the base end side of the opening forming surface 70, and the position of the observation window 44 in the first direction. Is an ultrasonic endoscope disposed on one side in the first direction from the position of the opening on one side of the opening 58.観察窓の観察視野で、処置具の基端部側まで観察することができる超音波内視鏡を提供する。挿入部１２の先端に設けられた先端硬質部３４と、先端硬質部３４に配設された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の基端側に設けられ、第１方向の一方側を開口方向とする開口部５８を有する起立台収容部６２と、開口部５８が形成された開口形成面７０と、起立台収容部６２の内部に設けられ処置具の導出方向を変更する処置具起立台６０と、を備える処置具導出部と、開口形成面７０の基端側に設けられた観察手段形成面７２に配設された観察窓４４と、を備え、第１方向における観察窓４４の位置が、開口部５８の一方側開口部位置より、第１方向の一方側に配設される超音波内視鏡である。
