An alerting illumination device, which includes a detecting component, a danger degree estimating component, a danger assuming component, an illuminating component and a controlling component, is provided. The danger degree estimating component estimates a degree of danger, with respect to a subject vehicle, of the person detected by the detecting component. The danger assuming component, on the basis of the estimated degree of danger, assumes whether or not the person detected by the detecting component is a danger with respect to the subject vehicle. The illuminating component illuminates light. The controlling component, in a case in which the danger assuming component assumes that the person is a danger, controls the illuminating component such that light, which shows a direction of the person who is assumed to be a danger and a distance to the person, is illuminated onto a road surface.