An imaging unit (1) provided in an endoscope (101) includes a movable lens (16) constituting a part of an objective optical system, a movable lens (16) holding the movable lens (16), and photographing light entering the objective optical system A movable lens holding frame (23) disposed so as to freely advance and retreat along the axis (O), a fixed frame (12) for accommodating and holding the movable lens holding frame (23) freely movably, and a fixed frame A driving unit (30) for generating a driving force for advancing and retracting the movable lens holding frame (23) along the photographing optical axis (O) with the movable lens holding frame (23) on the photographing optical axis And is formed to be curved so as to press a part of the one-way outer surface of the movable lens holding frame (23) against the inner surface of the fixed frame (12), and the driving part (30 And a flexible substrate (60) for supplying electric power to the flexible substrate (60).内視鏡(101)に設けられる撮像ユニット(1)は、対物光学系の一部を構成する可動レンズ(16)と、可動レンズ(16)を保持し、対物光学系に入光する撮影光軸(O)に沿って進退自在に配設された可動レンズ保持枠(23)と、可動レンズ保持枠(23)を進退自在に収容保持する固定枠(12)と、固定枠(12)内で可動レンズ保持枠(23)を撮影光軸(O)に沿って進退移動するための駆動力を発生する駆動部(30)と、可動レンズ保持枠(23)を撮影光軸(O)に直交する一方向へ付勢するように配設され、可動レンズ保持枠(23)の一方向の外形面の一部を固定枠(12)の内面へ押圧するよう湾曲形成され、駆動部(30)へ給電するためのフレキシブル基板(60)と、を具備する。
