A display device for a vehicle includes a main body, a guide, and a flexible display. The flexible display is configured to be inserted between a pair of guide plates of the guide. The pair of guide plates are transparent, and an area of the flexible display positioned between the pair of guide plates is configured to vary. The display device allows a front area of the vehicle to be viewed through the transparent guide plates, and allows a rear area of the vehicle to be disposed on the flexible display. The flexible display is configured to be protected by the pair of guide plates and deformed along the pair of guide plates.