In a vehicular air conditioning apparatus, a first blower unit is connected by a connection duct to a side portion of a casing constituted by respective air passages, and a second blower unit separate from the first blower unit is connected to a lower portion of the casing. The first blower unit adjusts an inflow rate of external air by means of an adjustment damper, which is disposed to face toward an opening of a duct, and the external air flows into the casing through an intake damper.