A foldable holder for a beverage container comprises a fastening plate, a supporting ring coupled pivotably to the fastening plate, a holding bracket coupled pivotably to the fastening plate, and a supporting plate coupled pivotably to the holding bracket. The supporting ring and the holding bracket share a pivot axis extending from the fastening plate. The supporting plate is coupled to a remote end of the holding bracket so as to be pivotable counter to a pivoting direction of the supporting ring. The holding bracket and the supporting plate are disposed radially within the supporting ring when folded into a retracted state.