Abstract: A business-card type display device, connected to a sling that hangs on the body of a user, includes a display and a casing. The display has a display screen. The casing covers the display. The casing is provided with a display-installed portion therein. The surface of the casing is provided with a display opening whose position corresponds to the position of the display-installed portion. The surface of the casing is provided with a sling-connected portion above the display-installed portion. The sling-connected portion is connected to the sling. The display is installed in the display-installed portion. The display screen emerges from the display opening. The identification information displayed by the business-card type display device can be rapidly changed, which is very effective in use.