An endoscope, a focus adjustment method for an endoscope, and an endoscope are provided. An endoscope including a distal end body and a lens, wherein a lens hole for disposing the lens is provided at a front end of the distal end body, wherein a side wall of the distal end body is provided. A focus adjustment hole 30 is provided in the lens, and the focus adjustment hole communicates with the lens hole to adjust an axial position of the lens in the lens hole. [Selection] Figure 1【課題】内視鏡先端部、内視鏡の焦点調節方法および内視鏡を提供する。【解決手段】先端部本体１０とレンズを含み、前記先端部本体の前端部に前記レンズを配置するためのレンズ孔２０が設置される内視鏡先端部であって、前記先端部本体の側壁に焦点調節孔３０が設置され、前記焦点調節孔が前記レンズ孔と連通し、前記レンズの前記レンズ孔での軸方向位置を調整する。【選択図】図１
