Patent ID: 8854748

Claim:
A lens barrel comprising: an image pickup optical system including a plurality of lens groups; a barrel member which holds the image pickup optical system and is protruded and retracted; a lens frame which holds a lens group of the image pickup optical system and is configured to be able to swing; a first engagement member including a cam-shaped portion configured to swing the lens frame by engaging with the lens frame to move the lens group to a position where an optical axis of the lens group is different from an optical axis of another lens group when the barrel member is retracted; and a second engagement member configured to engage with the lens frame, the second engagement member being an individual member separate from the first engagement member, wherein, when a state of the barrel member changes from a protruded state to a retracted state, the lens frame is swung while being engaged with the cam-shaped portion of the first engagement member, and then the lens frame is engaged with the second engagement member, wherein, in the retracted state, the lens frame is separated from the cam-shaped portion of the first engagement member by engaging with the second engagement member.