To provide a warning display lamp for an automobile for warning a driver of a following vehicle and a passer-by that a door of the automobile is open to urge them to act to avoid it, and easy to be installed in any vehicle already existing in the world and restricted in the generation of failure because of a small number of parts items and low cost.

A LED lamp 14 is embedded in a block body 12 for a display lamp of the alarm display lamp 10 for an automobile. The LED lamp 14 is connected to an output end of a multi-vibrator 20. The multi-vibrator 20 is embedded in a block body 22 for a driving circuit. The block body 12 for the display lamp is fitted to a thick part in rear of a door 102 of the automobile 100. The block body 22 for the driving circuit is fitted inside the door 102. An input end of the multi-vibrator 20 is connected in parallel with a door lamp 104 of the automobile 100 through a lead wire 24.