A lens barrel, includes: an image pickup optical system comprising a plurality of lens groups; a plurality of barrel members which house the image pickup optical system therein; and a drive source which moves at least two lens groups in the image pickup optical system in a direction of an optical axis, wherein the plurality of barrel members are split from each other into one on an object side with respect to the optical axis and one on an image surface side with respect to the optical axis, and the plurality of barrel members are fixed by a holding member of the drive source, the holding member being formed integrally with the drive source.