A tire mounting method is provided for automatically mounting a tire onto hub bolts of a motor vehicle. The method includes gripping the tire and temporarily tightening nuts on the hub bolts on which the tire has been placed with a first working mechanism. The nuts that have been temporarily tightened by the first working mechanism are fully tightened with a second working mechanism, which is disposed in association with a first mounting region on a front wheel side or on a rear wheel side of the motor vehicle. The nuts that have been temporarily tightened by the first working mechanism are fully tightened with a third working mechanism, which is disposed in association with a second mounting region on the rear wheel side or on the front wheel side of the motor vehicle.