A lens barrel is provided, including a radially-retractable optical element constituting a part of a photographing optical system, the radially-retractable optical element being movable between a photographing position located on an optical axis of the photographing optical system, and a radially-retracted position located on an off-optical-axis position; a biasing device for biasing the radially-retractable optical element toward the photographing position; and a swing member which is rotatable about an axis extending parallel to the optical axis, the swing member pushing the radially-retractable optical element against a biasing force of the biasing device to move the radially-retractable optical element to the radially-retracted position.