Similarly to the symbols 37, 37′, each of these arrow marks consists of an arrow-head portion tapered frontward from the own vehicle side and a step portion tapered frontward in accordance therewith. The arrow of the symbol image 44, 44′ and the arrow of the symbol image 37, 37′ may be displayed with the ends thereof on the own vehicle side overlapped to each other as starting therefrom. According to the above, the occupant can recognize the travel course for the lane change more distinctly in an intuitive and specific manner with respect to the actual course on which the own vehicle is currently travelling.