VEHICULAR AIR CONDITIONING UNIT

A vehicular air conditioning apparatus includes: a case which forms a passage for conditioned air that flows toward a vehicle interior; a partition plate which divides a space inside the case; a sliding door which moves to change the flow of the conditioned air inside the case; a rack gear provided on the sliding door; and a pinion gear which moves the sliding door by rotating while being engaged with the rack gear. In addition, the partition plate has a guide which slidably supports an end portion of the sliding door, the case has a seal member, the sliding door and the seal member are disposed to slidably oppose each other, the guide has a cut-out portion in which the seal member is disposed, and an auxiliary guide is provided in the cut-out portion. Accordingly, in the vehicular air conditioning apparatus in which the slide door is moved by a rack and pinion mechanism along the guide provided in the partition plate that divides the internal space of the case, noise generated by the rack and pinion mechanism may be reduced by suppressing the displacement of the slide door.