PURPOSE: To provide a partitioning device for air conditioning which can contribute to the forming of an environment in which hot air or cool air does not remain, without receiving a restriction for the setting position.

CONSTITUTION: The title partitioning device consists of a site plate 2, top plate 3 and bottom plate 4, and an air suction opening 2a is provided in the vicinity of the lower end of the side plate and/or in the vicinity of the intermediate height, and an air blow-out opening 3a is provided on the top plate. Also, the partitioning device is equipped with a partitioning main body 1 of which the hollow space is made to be a ventilating duct 5, and an air blowing fan 7 which is arranged between the air suction opening and air blow-out opening. By this constitution, cool air in the vicinity of the lower end of a desk 13 or hot air generated by an office appliance 14 is prevented from remaining.