a ventilator for an ignition distributor used with an automobile comprises an air intake passage for sucking air from the outside of the distributor and an air exhaust passage for exhausting the air to the outside of the distributor . each passage has one end opening in the upper surface of the bottom of the distributor , and the other end opening in the outer surface of the distributor . these openings of each passage are connected to each other through a passage bent at an obtuse angle or a passage having an intermediate bent passage portion formed in a circular arc shape .