Abstract: A large thin display unit has a chassis structure with a first horizontally or vertically disposed enclosure, a second vertically extending enclosure mounted to the upper side of the first enclosure, and a third vertically extending enclosure mounted above the first enclosure behind the second enclosure. The second enclosure has an opening that opens toward a front of the unit and has a margin along the perimeter of the opening. The thin display section is fixed to the margin in a vertical position. Further, an air route is formed between the third enclosure and a planar portion of the second enclosure, and an air route is formed between the thin display section and the planar portion of the second enclosure. Also, a wiring space is formed between the thin display section and the planar portion of the second enclosure. Preferably, the thin display section is a large liquid-crystal display provided with a plurality of backlights.