A tire testing machine includes a test station in which spindles to attach a tire on which a barcode is installed are provided, and first and second belt conveyors that feed the tire into a center position of the spindles. In order to stably grasp a position of identifying information of the tire and stop rotation of the tire at an arbitrary desired angle, before applying a lubricant to a bead portion on an inner periphery of the tire conveyed to the first belt conveyors by means of the lubricator and feeding the tire into the test station, a controller grasps a position of the barcode on the tire based on a rotation angle relative to the direction connecting a position where the barcode is detected by a barcode scanner and the center of the tire.