There is disclosed a display device comprising a display module, an outer case in which the display module is mounted and defining an internal space which is closed airtight from the outside, and an inner case coupled to the display module, wherein the inner case which partitions off the internal space into a first closed space having a rear surface of the display module exposed thereto and a second closed space having a front surface of the display module exposed thereto, and the first closed space is surrounded by the second closed space with respect to one cross section.