A display device includes a display panel including a front surface and a rear surface, a first circuit board electrically connected to a first side of the display panel, a second circuit board electrically connected to a second side opposite to the first side of the display panel, a third circuit board disposed on the rear surface and electrically connected to the first circuit board and the second circuit board, the third circuit board extending in a first direction, and a support plate disposed on the rear surface. The display panel is foldable along a folding line extending in a second direction. The support plate has a first opening extending along the folding line, and an opening pattern near a portion of the first opening. The third circuit board overlaps the portion of the first opening. The opening pattern includes slits and the third circuit board overlaps the slits.