The present disclosure relates to a dangerous situation notification assembly for a window shade device of a vehicle and a dangerous situation notification assembly for a rear window of a vehicle. A dangerous situation notification assembly for a window shade device for vehicles, according to the present disclosure, which has a shade provided on any one of upper and lower sides of a rear window and reciprocates between a shading position where the rear window is shaded and a rolling position where the shade is rolled from the shading position, comprises: a dangerous situation notification unit which is arranged in the shade and selectively emits light at the shading position of the shade to output a dangerous situation; and a light source unit which is adjacent to the shade and supplies light to the dangerous situation notification unit so that the dangerous situation notification unit selectively emits light.