Abstract: A vehicle air conditioning device is disclosed. The air condition device includes an air conditioning case having a passage in which air flows, a blower connected to the air conditioning case for blowing the air, a cooler and a heater housed in an interior of the air conditioning case, and a duct provided in the air conditioning case for conveying the air that has been temperature controlled by the cooler and the heater. The passage includes a cool air passage in which the cooler is disposed, a warm air passage in which the heater is disposed, and an introduction passage provided between the cool air passage and the warm air. A switching door is provided in the introduction passage for controlling an amount of the air flowing to the cool air passage and the warm air passage.