PURPOSE: To easily and securely attach or remove tubeless tires of large vehicles, such as a truck and a bus to or from rims, to enable the device to be easily manufactured, overhauled and assembled and to make the device portable by enabling the device to show high outputs regardless of the simplification and compactness of its overall structure.

CONSTITUTION: A pair of release rollers 16, 16' are held in place on a base 1 and a tire attaching portion 3 is provided in such a manner as to freely move with respect to the release rollers and in the direction Y of the major axis of a rotating shaft 4, whereby a tire 5 set in place on a tire attaching portion is attached to or removed from a rim 6.