Disclosed is a graphics display device comprising a graphics control board provided between a computer for outputting an output command of a picture image (hereinafter referred to as an image-depiction command) to be displayed on a display device such as a cathode ray tube (CRT) and said display device to process the image-depiction command from the computer by signal conversion processing and to control a display output when the display device displays a picture image, the graphics control board being divided into two boards of a signal conversion board provided within a housing case in which the computer is installed to process the image-depiction command from the computer by signal conversion processing and a display output board for controlling a supply of an output required to display the picture image by the display device on the basis of the image-depiction command.