Provided is a novel container sterilization method in which no liquid agent is used. A container sterilization method is a method of performing sterilization by supplying a sterilization component to a container P that is continuously conveyed along a predetermined conveyance path, the container sterilization method including supplying a humid ozone gas to a sterilization area 50, the humid ozone gas being an ozone gas that has humidity, the sterilization area 50 being partitioned by a sterilization chamber 51 that contains the conveyance path. It is preferable that the humid ozone gas to be supplied to the sterilization area 50 have a higher temperature than the container P to be conveyed to the sterilization area 50 and the sterilization chamber 51 have a higher temperature than the container P to be conveyed to the sterilization area 50.
