Patent ID: 7285041

Claim:
An air passage switching device comprising: a case for defining an air passage, the air passage having adjacent first and second opening portions partitioned from each other by a partition portion; a slide door slidable along the first and second opening portions in a sliding direction; a guide member, provided in the case, for guiding the slide door to be slidable; and a link mechanism for slidably moving the slide door along the guide member, wherein: the link mechanism includes a rotation shaft rotatably supported in the case, a link portion provided at one end portion of the slide door in the slide direction, and a link lever connected to the rotation shaft and the link portion; the link portion is positioned at a tip end portion of the link lever, and is rotatable around the rotation shaft only within a range of the second opening portion in the sliding direction, among the first and second opening portions; and the slide door is provided with a first seal portion for sealing a clearance with outer peripheral portions of the first and second opening portions, and a second seal portion for sealing a clearance with the partition portion.