Rain detection device

The present invention relates to a rain detection device (200) for a vehicle. The rain detection device comprises a camera, a light source (102) for emitting light for rain detection, a light sensor (120) for measuring an ambient light level, and a light guide (201). The light guide (201) is configured for redirecting the light emitted by the light source. Furthermore, the light guide (201) is configured for directing ambient light to the light sensor.