PURPOSE: An automatic ventilating device is provided to spread out a deodorizer after operating a ventilating fan by detecting the air pollution level in a bathroom. CONSTITUTION: An automatic ventilating device in a bathroom is composed of:a gas sensor(10) established at a specific place in a bathroom; a pollution representing unit(20) for representing a specific expression by controlling the operation according to the signal of operation control inputted; a ventilating fan(30) for controlling the driving according to the operation control signal inputted; an aromatic spraying device(40) for controlling the driving according to the operation control signal.
