Patent ID: 7780362

Claim:
A lens barrel comprising: a linear guide member; a linearly advancing/retracting member directly guided by said linear guide member along an optical axis of an imaging optical system to be movable between an operating position and a retracted position; and a displaceable element supported by said linearly advancing/retracting member to be movable between an on-axis position in which said displaceable element is positioned on said optical axis and an off-axis displaced position in which said displaceable element is displaced from said optical axis, wherein a linear guide projection is formed on said linear guide member and extends in a direction parallel to said optical axis to be engaged with said linearly advancing/retracting member, wherein said linear guide projection includes an accommodation through-cutout cut through a part of said linear guide projection in a radial direction, at least part of said displaceable element entering said accommodation through-cutout when said linearly advancing/retracting member is in said retracted position.