A flat panel display apparatus is provided which is capable of conducting a transition of a display unit between the landscape and portrait orientation at one step and rotating around the substantial central portion of said display unit. The flat panel display apparatus includes a thin flat display unit (1) having a rectangular shape display screen thereon; a stand unit (2) for supporting said display unit (1); and a horizontal rotary axis (3) which is secured to the display unit (1) on its rear side in the substantial center thereof and which holds said display unit (1) so that display unit (1) is rotatable by at least 90 relative to said stand unit (2) and is characterized in that said display apparatus is provided with translational motion means (21, 22, 23) which causes the translational motion of said display unit (1) in a vertical direction in an interlocking manner with the rotation of said horizontal rotary axis (3).