This relates to a multi-part attachment device for attaching a device to a stiffening element and to an outer skin of a vehicle. The multi-part attachment device comprises a base body having an angular profile for attaching the attachment device to the stiffening element and to the outer skin of the vehicle. Furthermore, the multi-part attachment device comprises an upper part with a lug, wherein the upper part is attached to the base body. This also relates to a method for attaching a device to a stiffening element and to an outer skin of a vehicle as well as to an aircraft with a multi-part attachment device.