To provide an endoscope capable of accurately controlling the rotation of an observation image with a simple and space-saving structure.SOLUTION: The endoscope according to the present invention comprises a cylindrical base end portion 10 having an insertion portion having an objective lens at its distal end and an eyepiece, and the proximal end portion 10 is provided behind the endoscope main body of the eyepiece 13 Two dove prisms 11 arranged in series along the optical axis X and rotating means 12 for rotating one of the two dove prisms 11 on the end side.(FIG.【課題】シンプル且つ省スペースの構造で、観察画像の回転を正確に制御できる内視鏡を提供する。【解決手段】本考案による内視鏡は、先端に対物レンズを有する挿入部及び接眼レンズを有する円筒状の基端部10を備え、基端部10が、接眼レンズ13の内視鏡本体後端側に、光軸Xに沿って直列配置された2つのダブプリズム11と、2つのダブプリズム11の一方11bを回転させる回転手段12とを有することを特徴とする。【選択図】図2
