Surgical endoscope 1 includes an insertion portion 2 of the freely rigid insertion into a subject, an operation portion 4 held by the user, is provided between the insertion portion 2 and the operation unit 4, the user bends in any direction it is, to freely change the angle of the insertion portion 2 with respect to the operation section 4, a bent shape maintaining portion 3 is fixed and held its bent shape, provided in the bent shape retention unit 3, the longitudinal axis of the insertion portion 2 with respect to the operation section 4 and preventing portion 24 twisting to prevent twisting around, including a.外科用内視鏡装置1は、被検体に挿入自在な硬性の挿入部2と、ユーザが把持する操作部4と、挿入部2と操作部4の間に設けられ、ユーザが任意の方向曲げることで、操作部4に対する挿入部2の角度を変更自在にし、その曲げ形状を固定保持する曲げ形状維持部3と、曲げ形状維持部3に設けられ、操作部4に対する挿入部2の長手軸回りの捩じれを防止する捻れ防止部24と、を具備する。
