To provide a lens device to/from which a vibration isolation lens can easily be fitted/detached by inserting/pulling a vibration isolation unit having the vibration isolation lens into/from the bottom face of the casing of the main body.

The vibration isolation unit 30 having the vibration isolation lens 44 corrects image blur by moving the vibration isolation lens 44 within a plane perpendicular to a photographic optical axis L. The vibration isolation unit 30 is inserted/detached into/from an opening 22A made in the lower side of the casing 22 of the main body. The vibration isolation unit 30 is fixed to the clip washer 42 of a diaphragm unit 28.