To set the different blowing temperatures corresponding to the blowing modes, by forming a ventilation path in the downstream of a heat exchanger for heat absorption, by the first ventilation path for guiding the air having passed through the heat exchanger for heat absorption to a blow-off port switching means, and the second ventilation path for guiding the air to the blow-off port switching means through a heat exchanger for radiation.

A heat exchanger for heat absorption 3 and a heat exchanger for radiation 4 are installed in a ventilation path 1, and each blow-off port 5 is formed downstream of the ventilation path 1. A blow-off port switching means 7 is installed just before each blow-off port 5. On this occasion, the ventilation path 1 in the downstream of the heat exchanger for heat absorption 3, is divided into a ventilation path 1a for guiding the air having passed through the heat exchanger for heat absorption 3 to the blow-off port switching means 7, and a ventilation path 1b for guiding the air having passed through the heat exchanger for heat absorption 3, to the blow-off port switching means 7 through the heat exchanger for radiation 4, by partitioning wall 8. Thereby the air sent into the ventilation paths 1a, 1b, is mixed in a blow-off duct 6, after passed through the blow-off port switching means, and is blown into a cabin after the air is adjusted to a desired temperature.