A transport system comprising: a track provided extending over a plurality of areas (Aa, Ab, Ac); a plurality of transport vehicles traveling along the track; an area controller (50a, 50b, 50c) having one of the areas as a control area and controlling the transport vehicles within the control area; a buffer provided at a position to and from which a transport vehicle within the control areas is allowed to transfer an article and on which the article can be temporarily placed; and a host controller transmitting to the area controller (50a, 50b, 50c) a transport command causing the transport vehicle to convey the article, wherein the area controller (50a, 50b, 50c), when the number of the transport vehicle: present within the control area is a prescribed number set in advance and when receiving a first transport command for conveying the article from a transfer port of the article for a processing apparatus within the control area to a transport destination outside the control area from the host controller, stores therein the first transport command and transmits to the host controller a report indicating that the first transport command is not capable of being assigned to the transport vehicle, and the host controller, when receiving the report from the area controller (50a, 50b, 50c), when a buffer that is capable of placing the article is available, transmits a command for deleting the stored first transport command to the area controller (50a, 50b, 50c) generates a second transport command for conveying the article from the transfer port to the butter, and transmits the second transport command to the area controller (50a, 50b, 50c). a track provided extending over a plurality of areas (Aa, Ab, Ac); a plurality of transport vehicles traveling along the track; an area controller (50a, 50b, 50c) having one of the areas as a control area and controlling the transport vehicles within the control area; a buffer provided at a position to and from which a transport vehicle within the control areas is allowed to transfer an article and on which the article can be temporarily placed; and a host controller transmitting to the area controller (50a, 50b, 50c) a transport command causing the transport vehicle to convey the article, wherein the area controller (50a, 50b, 50c), when the number of the transport vehicle: present within the control area is a prescribed number set in advance and when receiving a first transport command for conveying the article from a transfer port of the article for a processing apparatus within the control area to a transport destination outside the control area from the host controller, stores therein the first transport command and transmits to the host controller a report indicating that the first transport command is not capable of being assigned to the transport vehicle, and the host controller, when receiving the report from the area controller (50a, 50b, 50c), when a buffer that is capable of placing the article is available, transmits a command for deleting the stored first transport command to the area controller (50a, 50b, 50c) generates a second transport command for conveying the article from the transfer port to the butter, and transmits the second transport command to the area controller (50a, 50b, 50c).