An air conditioning device for a vehicle includes a foot duct main body portion and a protruding portion. The foot duct main body portion extends in the vehicle width direction inside an instrument panel, and is formed in a substantially tubular shape, one length direction end portion of which is connected to an air conditioning device main body. Blowing apertures that open toward the vehicle lower side of a vehicle cabin interior are formed at each of another length direction end portion and a length direction intermediate portion of the foot duct main body portion. The protruding portion provided at a region of a vehicle upper sidewall portion of the foot duct main body portion corresponds with the blowing aperture formed at the length direction intermediate portion. The protruding portion protrudes toward an opening of this blowing aperture formed at the length direction intermediate portion.