Provided is a loading device that is provided in a tire testing machine including a testing station (30) provided with a spindle (31) attached with a tire (50) to be tested and feeds the tire (50) from a predetermined standby position to a testing position where the center of the spindle matches the center of the tire (50) in the testing station (30). The loading device includes: conveyors (1, 2) that convey the tire (50) from the standby position toward the testing position in a direction perpendicular to the axial direction of the tire; and positioning devices (6B, 20) that position the tire to be tested to a position, in which a front end of the tire in the feeding direction matches a point separated from the spindle by a predetermined distance, as the standby position. Setting of the standby position based on the position of the front end of the tire (50) in the feeding direction shortens the feeding distance and the feeding time and hence shortens the testing cycle time.