In order to provide an imaging unit that can obtain a high-quality captured image by preventing axial displacement of the moving lens frame, the stopper member 58 is positioned and fixed in a state of being applied to the outer peripheral surface of the rear lens group frame 57, The movement of the moving lens frame 65 to the retracting side along the photographing optical axis O is restricted by the contact between the stopper portion 58b of the stopper member 58 and the operating rod 65a, and moved to a position for realizing the second focal length. The lens 66 is held.移動レンズ枠の軸ズレを防止して高品質な撮像画像を得ることができる撮像ユニットを提供するため、ストッパ部材５８を、後群レンズ枠５７の外周面に当てつけた状態にて位置決め固定し、このストッパ部材５８のストッパ部５８ｂと操作桿６５ａとの当接によって移動レンズ枠６５の撮影光軸Ｏに沿った退避側への移動を規制して、第２の焦点距離を実現する位置に移動レンズ６６を保持する。
