To provide a tire attaching/detaching device allowing easy attaching/detaching of a flat tire or a run-flat tire.

A tool 32 arranged in the side of a tire claw 1 and comprising a bead press roller 3 and a demount claw 4 is attached at the end of a shaft restrained not to rotate. The shaft 22 is fitted in and supported by a bearing 28 and slidable in the axial direction. The tool 32 is attached to the end of the shaft to invert its direction. A bead up roller 9 is provided below the tool.