A physical distribution management system includes an information write unit that writes, on an information recording medium attached to a conveyance container input to a conveyance unit, a size of the conveyance container; a size detection unit that detects the size of the conveyance container input to the conveyance unit; and an error detection unit that determines that an input error for the conveyance container input to the conveyance unit occurs when the size written on the information recording medium attached to the conveyance container input to the conveyance unit does not coincide with the size of the conveyance container input to the conveyance unit detected by the size detection unit.