To provide an economical image display device for a slot machine or pachinko/slot machine and an image display method of the image display device for the slot machine or pachinko/slot machine which can greatly shorten the drawing processing time of individual images under restrictions of limited size and cost and draw many images by using the time obtained by shortening the processing time.

The image display device for the slot machine or pachinko/slot machine is provided with a display means 200 which displays images, the display means 200 being so constituted that when image information is displayed, transparent bits are imparted to respective pieces of image data of a plurality of pixels constituting the individual image information stored in a CG memory 2 or frame memory 4 stored with a plurality of pieces of source image information and when specified image information read out of the CG memory 2 is transferred to the frame memory 4 for display data storage, the image data having transparent bits are transferred by pixels to the frame memory 4 for display data storage as they are.