To provide an air conditioning device singularly performing processings of latent heat and sensible heat, reducing production and installation costs, and saving on energy.

This drainless air conditioning device 10 conditions the mixed air obtained by mixing a part of indoor air RA and the outside air OA. A first adsorption heat exchanger 51 and a second adsorption heat exchanger 52 perform humidity adjusting processing of the air. An air heat exchanger 60 exchanges heat between the fluid after heat treatment by a heat source and the air. The humidity of the outside air is adjusted by the first adsorption heat exchanger 51 or the second adsorption heat exchanger 52, and mixed with a part of the indoor air RA to be the mixed air. The mixed air exchanges heat with cold water or warm water by the air heat exchanger 60. The exhaust EA is discharged outdoors after its humidity is adjusted by the first adsorption heat exchanger 51 or the second adsorption heat exchanger 52.