A tire mounting method for automatically mounting tires onto hub bolts of a motor vehicle using a tire mounting device having a first working mechanism and a second working mechanism. The method includes feeding the motor vehicle intermittently so that hub bolts of a front wheel and hub bolts of a rear wheel are successively positioned in a tire mounting station. Tires are gripped by a tire gripping unit of the first working mechanism, and nuts are successively temporarily tightened onto hub bolts of front and rear wheels to which the tires are mounted. The nuts, which have been temporarily tightened, are then fully tightened using the second working mechanism.