An air passage switching device for a vehicle air conditioner includes first
and
second openings and a rotary door for opening and closing the first and second
openings. A rib having a first middle seal surface and a rib having a second middle
seal surface are provided in a case to protrude an inner side and to be separated
by a predetermined angle in a rotation direction of the rotary door. Further, the
rotary door has a door structure angle that is larger than a door operating angle.
In addition, the first and second middle seal surfaces and first and second end
seal surfaces are provided in the case so that the predetermined angle is a difference
between the door structure angle and the door operating angle. Accordingly, arrangement
positions of the first and second openings can be readily set without increasing
a door operating amount.
