A flat-type image display, such as, a plasma display, a LCD display, an OLED display, etc., in particular, for improving a cooling efficiency of a display panel, various kinds of substrates and an image display element, within the thin-sized housing thereof, comprises: a display panel; a chassis, which supports the display panel from a rear surface side thereof; a front surface-side cover, which is provided on a front side of the display panel; a rear surface-side cover, which is provided on a rear side of the display panel; an image display element connected with the display panel; a display driver substrate, which is connected with the display panel, and on a surface of which opposite to the chassis are provided circuit parts thereof; a power source substrate, which supplies driving power to the display driver substrate and the image display element, and on a surface of which opposite to the chassis are provided circuit parts thereof; and a first insulator board, which is provided at a position opposite to the display driver substrates and the power source substrate of the chassis.