To provide a furniture overturning prevention tool which can be installed even by an aged person with comparatively small force.

Two pressing boards 2A and 2B abutted on furniture and a ceiling are provided at two vertically opposing apexes 4A and 4B of a pantograph type linking mechanism 3. By adjusting an interval between two horizontally opposing apexes 4C and 4D of the pantograph type linking mechanism 3, a height adjusting screw 5 for adjusting the height of the pressing boards 2A and 2B is arranged horizontally through the apexes 4C and 4D, and an operation knob 6 for manually rotating the screw 5 is provided on at least one end side of the screw 5.