PURPOSE: To indicate driving information at easy-to-see positions at all times even when a driver's visual field changes by changing the position of displayed image of driving information according to the speed of vehicle.

CONSTITUTION: Outputs of a speed sensor 14 are converted by a frequency voltage converter according to the speed of vehicle and supplied to a motor 9. When the speed is low, output voltage from the converter 15 is also low, and accordingly, the displayed image of driving information given by a reflecting mirror 8 is formed at a relatively low position as 3'. When the speed is increased and becomes high, the output voltage of the frequency voltage converter 15 becomes high, and accordingly, the reflecting mirror 8 is rotated by the motor 9, and a displayed image is formed at a relatively high position as 3. As the position of displayed image changes with speed, the indication becomes easy to see even if a driver's visual field becomes gradually narrow. A projector 7 contains a reflection condensing mirror 71, a light source lamp 72, a liquid crystal panel 73 and a lens 74, and projects the displayed image of driving information displayed on the liquid crystal panel 73 through a transparent cover 75.