Air passage opening/closing device and vehicle air conditioner using the same

An air passage opening/closing device comprising:

• a case for defining an air passage through which air flows, the case having an opening portion of the air passage;
• a slide door disposed in the case to be movable in a door moving direction for opening and closing the opening portion, the slide door including a flexible film member disposed at an upstream side of the opening portion in an air flow direction, the film member having a free top end in the door moving direction;
• a driving device for moving the slide door;
• a guide member defining a guide ditch for guiding a movement of the film member, the guide member being provided in the case;
• and
• a pushing member that pushes the film member toward a seal surface around the opening portion of the case, the seal surface having a first surface in a direction parallel to the door moving direction, and a second surface in a direction perpendicular to the door moving direction, wherein:
• the free top end of the film member is moved forward along the guide ditch by a pushing force from the driving device to the film member;
• and
• the pushing member is disposed to push the film member toward the second surface such that a clearance between the film member and the second surface generally becomes smaller than a clearance between the film member and first surface.