An exchangeable lens includes a camera lens mount unit having a mount center point, to which a camera body, with twelve body connector terminals disposed near a camera body mount unit at the camera body, is attached; a holding portion where a plurality of lens connector terminals, each including a contact area to come into contact with a body connector terminal, are disposed; an optical system that includes a drive target member which can be driven; a drive unit that drives the drive target member; and a control unit to be engaged in data communication with the camera body. The drive unit and the control unit include a common ground portion.