To provide a safety device of structure simpler than a conventional structure at low cost, in regard to a safety device provided with an appearing/disappearing stopper on the placing surface of an elevating load stand.

A stopper 11 is pivotally supported in an opening 5 formed on the placing surface 4 of the load stand 1, and the stopper 11 is projected downward from the lower surface 7 of the load stand at one end 11a thereof and projected upward from the placing surface 4 at the other end 11b on both sides of a shaft 12, and the other end 11b projected upward from the placing surface 4 can resist the movement of a load. When one end 11a abuts on the ground by the lowering movement of the load stand 1, the stopper 11 is turned so as to house the other end 11b in the opening 5.