A conveyance system comprising: a track ; a plurality of conveyance vehicles traveling along the track and each conveying a conveyed object ; and a controller configured or programmed to output a conveyance instruction for the conveyed object to the plurality of conveyance vehicles , characterized in that when a first conveyed object placed on a downstream port , which is a place capable of accommodating the conveyed object thereon, is in a state waiting for collection, and when another conveyed object different from the first conveyed object is not placed on an upstream port , which is on an upstream side of the downstream port in a travel direction of the conveyance vehicles and capable of accommodating the conveyed object thereon, the controller is configured or programmed to: wait without outputting a conveyance instruction instructing collection of the first conveyed object until any of the conveyance vehicles conveying a second conveyed object to the upstream port has been recognized until a waiting time (T1) set in advance has elapsed since the first conveyed object changed to the state waiting for collection; and output the conveyance instruction instructing collection of the first conveyed object when the waiting time (T1) has elapsed since a point in time when the first conveyed object changed to the state waiting for collection. a track ; a plurality of conveyance vehicles traveling along the track and each conveying a conveyed object ; and a controller configured or programmed to output a conveyance instruction for the conveyed object to the plurality of conveyance vehicles , characterized in that when a first conveyed object placed on a downstream port , which is a place capable of accommodating the conveyed object thereon, is in a state waiting for collection, and when another conveyed object different from the first conveyed object is not placed on an upstream port , which is on an upstream side of the downstream port in a travel direction of the conveyance vehicles and capable of accommodating the conveyed object thereon, the controller is configured or programmed to: wait without outputting a conveyance instruction instructing collection of the first conveyed object until any of the conveyance vehicles conveying a second conveyed object to the upstream port has been recognized until a waiting time (T1) set in advance has elapsed since the first conveyed object changed to the state waiting for collection; and output the conveyance instruction instructing collection of the first conveyed object when the waiting time (T1) has elapsed since a point in time when the first conveyed object changed to the state waiting for collection. wait without outputting a conveyance instruction instructing collection of the first conveyed object until any of the conveyance vehicles conveying a second conveyed object to the upstream port has been recognized until a waiting time (T1) set in advance has elapsed since the first conveyed object changed to the state waiting for collection; and output the conveyance instruction instructing collection of the first conveyed object when the waiting time (T1) has elapsed since a point in time when the first conveyed object changed to the state waiting for collection. <EOS>