A display control unit (11) displays, on a left rear indicator (3L) and a right rear indicator (3R), rearward images that are captured from the vehicle (1) by a left rear camera (2L) and a right rear camera (2R) mounted on a vehicle (1) with a guiding line, which represents an estimated distance from the vehicle (1), superimposed upon the images. A road shape recognition unit (13) recognizes the shape of a road on which the vehicle is traveling. When the road shape recognition unit (13) has recognized that the vehicle (1) is traveling on a road of a prescribed shape, the display control unit (11) either hides the guiding line or sets the display position of the guiding line in accordance with the road shape recognized by the road shape recognition unit (13).