A plasma display apparatus including a unit for reinforcing a coupling force of a boss to a chassis is disclosed. In one embodiment, the apparatus includes: a chassis disposed on a side of a plasma display panel displaying images using a gas discharge, and supporting the plasma display panel, a boss coupled to the chassis and a reinforcing unit reinforcing the coupling structure between the chassis and the boss. According to one embodiment, the coupling structure between the bosses, which support the circuit board, and the chassis can be reinforced, and thus, the bosses are not separated from the chassis and the plasma display apparatus can operate stably.