To easily apply air conditioning utilizing evaporation.

This air conditioning unit A is provided with an evaporating means 20, an outside air passage 30, and an indoor air passage 40 in a housing 10 composed of a heat insulating material. The evaporating means 20 are mounted in several stages in the housing 10 through the indoor air passages 40, each evaporating means 20 has a water tank 51a for storing the water 50a as a vaporized material 50, and the outside air is passed through on the water surface to vaporize the water. The indoor air is passed while kept into contact with a bottom portion 52 of a water tank 51a cooled by removing vaporized latent heat, and the indoor air is forcibly circulated indoors to condition the indoor air.