An air conditioning duct arrangement for a vehicle includes an air conditioning unit disposed near a rear wheelwell of the vehicle, a floor panel including a lower section, a rise rising from the lower section, and an upper section extending backward from the rise, and a duct which extends from the air conditioning unit in the right-and-left direction of the vehicle in an area behind the rise, and which is formed so as to open forward into a compartment of the vehicle through the rise.