To provide a vibration-proof joint (connection metal fittings) that absorbs the vibration energy of earthquakes acting upon a solid matter by enlarging its tensile strength or moment of inertia utilizing the principle of leverage, and by directing this tensile strength or moment of inertia in the opposite direction of the earthquake vibration energy acting upon the solid matter, absorbs the resonance of the solid matter, such as a rack, or its center of gravity, with earthquake vibrations, and prevents the rack from toppling over.

A tensile strength and moment of inertia having instantly occurred in a fixed arm and its axis are enlarged by the effect of leverage. These factors enlarged tensile strength and moment of inertia get the vibration energy of earthquake absorbed on the axis bolt, weaken the vibration energy of this solid matter and prevent its center of gravity from vibrations.