Abstract: A vehicle-use lamp fixture unit which can prevent dimming of a lamp due to fogging is provided. The unit comprises a bulb (light bulb); a lens for transmitting light from the bulb; a rear window glass at a position facing the lens; a case for enclosing the bulb and the lens, an open end of the case being in contact with the rear window glass; an air suction passage extending from an exhaust port of a defroster and passing through a space formed between the lens and the rear window glass; and an air exhaust passage for exhausting air from the space. A braking indication mechanism connected to a brake pedal is also provided.