The present invention provides a lens barrel in which all lens groups are attached
to a leading cylindrical body. A movable lens group of the lens groups is moved
by a driving source incorporated in the leading cylindrical body. The lens barrel
is less likely to be influenced by external forces and can be made smaller. The
lens barrel includes first, second, and third cylinders, and first, second, and
third lens groups attached to the third cylinder, which is extended first among
the first, second, and third cylinders. The first and third lens groups are fixed
to the third cylinder, and the second lens group is disposed between the first
and third lens groups and movable along the optical axis.
