To provide an inexpensive air conditioning system capable of making a room comfortable with a simple structure without using an exclusive air conditioner.

In this air conditioning system comprising an air conditioning device 10 having a suction port for sucking the air of a room 1 and a blow out port for supplying the conditioned air, and a cabinet 20 storing the air conditioning device 10, a first floor opening 4 and a second floor opening 5 connecting a under floor 3 and the room 1 are formed on a floor 2 of the room 1, the cabinet 20 has a suction opening 21 connected with the suction port and a supply opening 22, the conditioned air supplied from the supply port is guided to the supply opening 22 and the first floor opening 4, the conditioned air supplied from the blow out port is distributed to the under floor 3 through the first floor opening 4, and the conditioned air distributed to the under floor is distributed to the room 1 through the second floor opening 5.