A lamp for a vehicle is provided and includes a signal lamp (200) that displays a predetermined image of repetition on an exterior mirror of a vehicle. The lamp further includes a mirror housing (100) into which a mirror is installed and a signal lamp (200) disposed on one surface of the mirror housing. The signal lamp (200) includes a reflection unit (210), a lens unit (230) disposed at a predetermined distance apart from the reflection unit (210) and having a half mirror (231) installed on at least one surface thereof, and a first light source unit (220) disposed between the reflection unit (210) and the lens unit (230) and is about the same distance apart from the reflection unit (210) and the lens unit (230).