A display unit includes a display mounting main body 1 secured to a ceiling to which a display is installed; the display 3 openably/closably and rotatably attached to the display mounting main body 1 through a pair of lateral rotating hinge shafts 2; and a circuit board provided as a control system of the display, wherein a wiring-relay circuit board 8 is mounted and disposed on the axis of rotation at the upper part in the extending rotating position of the display 3, and electrically connects a main circuit board disposed in the display mounting main body 1 with an LCD 4 to thereby intermediately connect wirings.