Provided is a lens barrel configured to avoid deviation of a retracting lens holder frame and a retracting lens holder frame driving member from regular position. Also provided are a camera, a portable information terminal device, and an image input device, all of which use this lens barrel. With the above devices, even when normal cam engagement is damaged by occurrence of drop impact or the like, it is possible to secure normal driving of the retracting lens holder frame and to reduce malfunction of the retracting lens holder frame.