To provide an air conditioning device wherein the load of an air conditioner can be reduced and the device itself and the operation cost thereof can be suppressed.

In an artificial skiing ground 10 wherein artificial snow 20 is laid within a building including an inclined area 12 between a sliding start point 31 and a sliding end point 32, a liquefied nitrogen tank 17 and a chamber 18, which are connected by a duct 17a, are installed, and a blower mechanism 19 is provided to cause a low temperature gas produced in the chamber 18 to flow only through a lower space over the surface of the artificial snow in the form of a laminar stream.