A plurality of light sources to assist in image capturing is attached to a vehicle at low cost and simplicity. Three light sources that illuminate a side area in the same direction of the vehicle are fixed to and accommodated in the same housing in a state where light axes of the light sources are directed to different directions from each other. Through this, the three light sources are integrated into a side camera unit by the housing. Accordingly, by attaching the side camera unit only, the light sources can be attached to the vehicle at a time. As a result, the light sources for widely illuminating the side area of the vehicle can be mounted on the vehicle at low cost and simplicity.