To provide a lens barrel constituted of members having improved strength, in addition to the accomplishment of the reduction of a manufacturing cost.

The peripheral side part of a clearance part 104c is engaged with a fixed leg part 114a, irrespective of the position of a 1st lens holding barrel 104 in an optical axis direction, so that the rotation of the 1st lens holding barrel 104 is limited, and also, the barrel 104 is moved and guided in the optical axis direction. Thus, it is not required to install a key member in order to guide the 1st lens holding barrel 104, then, the manufacturing cost is reduced. On the other hand, in the case the key member can be eliminated, a straight guiding groove formed in the holding barrel in accordance with the key member is dispensed with, then, the rigidity and strength of the holding barrel 104 are improved.