Ultrasonic observation suction force adjusting apparatus according to the present invention, the observation transmits ultrasound to a subject, the observation target in the observation target by receiving the ultrasonic waves reflected ultrasonic observation in an ultrasonic observation used a suction force adjusting device, one end of which is connected to the suction pump and the other end is provided in a part of the channel leading to the contact portion with the observation target, changeable suction the suction force of the suction pump in the other end and force change unit, and suppress damper means a change in the suction force of the suction force change unit, equipped with本発明に係る超音波観察用吸引力調整装置は、観測対象へ超音波を送信し、該観測対象で反射された超音波を受信することによる観測対象の超音波観察に用いられる超音波観察用吸引力調整装置であって、一端が吸引ポンプに接続され、他端が観測対象との接触部分に通じる流路の一部に設けられ、他端側における吸引ポンプの吸引力を変更可能な吸引力変更部と、吸引力変更部の吸引力の変化を抑制するダンパ手段と、を備えた。
