An automotive winker device comprises a light source accommodated in a light source chamber defined in a cover case of a door mirror or a side view mirror. Light transmission holes with transparent plates are provided in the light source chamber to project light rearwardly and sideways of the vehicle. A light shelter wall is provided for preventing light from scattering to the mirror and for having adverse effects on the mirror. The light shelter wall is removably mounted to provide access to the interior of the light source chamber, for example for replacement of the light source. Operation of the winker is clearly and reliably observable by nearby vehicles and persons as well as the driver, thereby reducing areas of non-visibility and promoting traffic safety.