a ventilating apparatus for a conveyance has a first conduit disposed on the upper portion of a vehicle so as to supply conditioned air allowed to flow from an air conditioned device into a compartment , a second conduit disposed in the lower portion of the vehicle so as to suck and circulate air in the compartment , a a third conduit disposed in the lower portion of the vehicle so as to suck and introduce air in the compartment into an exhaust device . the air conditioning device conditions air by mixing air circulated from the second conduit and air sucked from the outside of the compartment by a suction device . when the compartment is partitioned , the ventilating apparatus is individually provided for each partitioned compartment and the third conduit is connected to a discharge port of a lavatory .