A heat exchanger unit includes a heat exchanger, a drain pan, and a housing. The drain pan is a pullout drain pan capable of being pulled out sideways from the housing. A dew dripping space is formed between the heat exchanger and the outlet side surface of the housing, and in the dew dripping space, dew formed at the heat exchanger and blown off by an air flow drips into the drain pan due to its own weight before reaching the outlet of the housing. The heat exchanger unit further includes a fixing component by which the heat exchanger is fixed to the outlet side surface of the housing without interfering with the lateral movement of the drain pan and that forms the dew dripping space between the heat exchanger and the outlet side surface of the housing.