A vehicle information projecting system, comprising: an image-capturing unit which is capable of imaging, as an actual landscape, a road which is present at a front side of a vehicle; a display mechanism which is capable of projecting vehicle information in a display range which is set within a part of a window shield of the vehicle and then displaying the vehicle information in the display range so that a virtual image of the vehicle information overlaps the actual landscape in a viewpoint of a driver of the vehicle; a rear side information acquiring unit which is capable of acquiring rear side vehicle information which is representative of a rear side vehicle being present at a rear side of the vehicle; a lane change information acquiring unit which is capable of acquiring lane change information which is representative of the vehicle making a lane change from a traveling lane of the vehicle to an adjacent lane which is adjacent to the traveling lane; and a processing unit to determine a degree of caution as to the rear side vehicle, based on the rear side vehicle information and the lane change information, wherein the processing unit is capable of generating the vehicle information so that the vehicle information includes the degree of caution and the virtual image of the vehicle information overlaps a boundary line (WL1-4) between the traveling lane and the adjacent lane thereto; and wherein the vehicle information projecting system further comprises a steering angle sensor which is capable of acquiring steering angle information representative of a steering wheel of the vehicle being manipulated; characterized in that the processing unit is capable of generating a trajectory line (TRn, TSRn) so that an angle formed between the trajectory line (TRn, TSRn) and the boundary line (WL1-4) increases as an amount of manipulation of the steering wheel increases; wherein the angle does not increase when the amount of manipulation reaches a predetermined amount. an image-capturing unit which is capable of imaging, as an actual landscape, a road which is present at a front side of a vehicle; a display mechanism which is capable of projecting vehicle information in a display range which is set within a part of a window shield of the vehicle and then displaying the vehicle information in the display range so that a virtual image of the vehicle information overlaps the actual landscape in a viewpoint of a driver of the vehicle; a rear side information acquiring unit which is capable of acquiring rear side vehicle information which is representative of a rear side vehicle being present at a rear side of the vehicle; a lane change information acquiring unit which is capable of acquiring lane change information which is representative of the vehicle making a lane change from a traveling lane of the vehicle to an adjacent lane which is adjacent to the traveling lane; and a processing unit to determine a degree of caution as to the rear side vehicle, based on the rear side vehicle information and the lane change information, wherein the processing unit is capable of generating the vehicle information so that the vehicle information includes the degree of caution and the virtual image of the vehicle information overlaps a boundary line (WL1-4) between the traveling lane and the adjacent lane thereto; and wherein the vehicle information projecting system further comprises a steering angle sensor which is capable of acquiring steering angle information representative of a steering wheel of the vehicle being manipulated; characterized in that the processing unit is capable of generating a trajectory line (TRn, TSRn) so that an angle formed between the trajectory line (TRn, TSRn) and the boundary line (WL1-4) increases as an amount of manipulation of the steering wheel increases; wherein the angle does not increase when the amount of manipulation reaches a predetermined amount.