An information processing apparatus, especially a display apparatus or a flat display unit also serving as an input apparatus is required to be reduced in size since it is mounted on a case. For this, a flat unit structure in which a flat−plate−shaped rectangular flat display unit (5) is fixed to the case (4) with fixing members (12, 13) at three position: at three positions: at the right and left sides and the upper center of the flat display unit (5) is characterized in that the right and left side of the flat display unit (5) are fixed to a back cover (4) serving as the case by using the fixing member (12) via a screw while the upper center of the flat display unit (5) is fixed to the case by sandwiching the back surface and the front surface by using the fixing member (13).
