A liquid crystal display device of a motorcycle is configured and arranged to rapidly warm up a liquid crystal panel at cool temperatures, without requiring an additional heating member. The liquid crystal display device includes a control unit, for controlling a liquid crystal panel, and a backlight. When the temperature of liquid crystal is lower than a predetermined value, or when it is within a fixed time period after turning on an ignition switch, as a warm-up period, the control unit increases power supplied to the backlight to a larger amount than that in a normal display state, to increase the amount of back light, and temporarily changes the entire display surface to a darker color, in order to increase the amount of light absorbed by the liquid crystal panel, simultaneously reducing the amount of light penetrating the display surface, and thereby speeding up warming of the liquid crystal panel.