The invention is an indicator lamp for warning signal to a person who approaches the vehicle to steal a vehicle. The indicator lamp includes a lamp unit including a light emitting diode (LED). The indicator lamp includes a light guide including an elongated portion and a cover portion. The elongated portion receives a light from the LED at one end and conveys the light to a light emitting end. The cover portion covers the LED of the lamp unit and is integrally formed with the elongated portion. The light guide connects with the lamp unit at the cover portion. The indicator lamp prevents rainwater from the top from entering the lamp unit.