To provide safety for overturning which can joint the surface for mounting a machine body positively to the machine body through a simple structure without requiring any bonding means and can prevent overturning of the machine body surely and stably.

In the safety for overturning, a sucker 2 made of a cup-type elastic member and sustaining tightness upon touching the fringe part thereof is provided on the bottom of a machine body 1 while directing the fringe downward. A supporting member 4 having a thickness required for supporting the machine body 1 is fixed to the bottom of the machine body 1 at a flattened level of the sucker 2 where the inner space is compressed enough to exhibit a required suction force.