To provide a method capable of easily removing an upper bead of a flat tire, a run-flat tire and an unremovable tire having a small width to a wheel width.

A demount claw 4 forms an outside groove 31 of heightening its position and an inside groove 32 of lowering a position in a tip part, and this demount claw 4 is deformed by pressing to the upper bead part vicinity of the tire 21, the tire upper bead 23 is engaged with the outside groove 31, the inside groove 32 is engaged with a lug part 24 of a wheel 20 by lifting the demount claw 4, the wheel 20 is rotated in this state, and the tire upper bead 23 is removed by pushing up a tire lower side surface by a bead-up roller.