The lens barrel of the present invention, in order to provide a lens barrel capable of reliably and easily preventing the breakage of the tooth of the revolving shaft of the driving motor and the tooth of the rack which teeth are engaged with each other, the lens barrel is provided with: the driving motor; the lens unit holder that has the rack receiving the transmission of the driving force by engaging with the revolving shaft which is a part of the driving motor, and holds the lens unit holder; and the spear portion that releases the engagement between the part of the revolving shaft and the rack.