There are included a vehicle behavior estimating unit (10) that estimates behavior of a vehicle (1); pattern illuminating units (4a to 4d) that illuminate a projection pattern onto ground around the vehicle (1); and an illumination control unit (11). The illumination control unit (11) controls the pattern illuminating units (4a to 4d) to illuminate a projection pattern, on the basis of the behavior of the vehicle (1) estimated by the vehicle behavior estimating unit (10).