A foldable display device includes; a plurality of substrates separated from one another by predetermined intervals, a plurality of driving units including at least one driving unit disposed on each of the plurality of substrates, a flexible display unit disposed above the plurality of substrates and including a plurality of pixel electrodes respectively corresponding to the plurality of driving units, and a flexible connection unit disposed between the plurality of substrates and the flexible display unit and which electrically connects the plurality of driving units and the plurality of pixel electrodes.