A display device for a vehicle includes a collision predictor, a display member, and a display controller. The collision predictor detects a moving body sideward of a course of the vehicle and predicts collision of the vehicle with the moving body detected. The display member provides display of an image or display of a mark, for view of a driver seated on a driver's seat of the vehicle. The image or the mark corresponds to the moving body. The display controller performs a control of the display member. The display controller changes the display of the image or the display of the mark more significantly than a motion of the moving body as actually seen from the driver's seat, on a condition that the collision predictor predicts the collision.