A display device includes a display module, an outer frame, an active engaging unit, and a passive engaging unit. The display module has at least one side surface. The outer frame surrounds the display module and has last least one inner surface facing the side surface, wherein a gap is formed between the inner surface and the side surface. The active engaging unit extends from the display module into the gap and further extends along the gap. The passive engaging unit is disposed on the inner surface and protrudes toward the side surface. The active engaging unit engages with the passive engaging unit to restrict the relative movement between the display device and the outer frame.