A display device includes a display panel, a protective member, a light guide member, a light source, and a light leakage preventing member. The display device includes a display surface concavely curved in a first direction. The light leakage preventing member is coupled to the protective member to be movable according to expansion or contraction of the light guide member. The light leakage preventing member contracts and expands according to the expansion or contraction of the light guide member, and includes an elastic part to prevent the light source from being damaged by the expansion of the light guide member.