Abstract: A side flashing lamp (1) for an external rear view mirror includes a lamp housing (2) with a light exit opening (3) extending from the vehicle side approximately horizontal towards the outside. At least one light guide (6, 7) extends over the light exit opening. The light of a light source (10, 11) is coupled into the vehicle end (8, 9) of the light guide and is propagated in the longitudinal direction. The portion of light arriving at the opposite end (12, 13) is emitted inclinedly rearwardly with respect to the direction of travel.