A clamping device for components to be joined, which clamping device comprises: a first component holder for a first component, a second component holder for a second component, and a clamping structure which secures the component holders relative to one another in a joining position, and when the component holders are in the joining position, the clamping structure extends from an external face of the first component holder to an external face of the second component holder facing away from the external face of the first component holder and extends respectively around a peripheral edge of the component holders.