An earthquake-proof plinth includes a display floor plate that has an aperture configured to fit a middle section of an article seated on the plinth and that has a seat panel passing through the aperture and supported by a shaft extending vertically downward from the seat panel; a vibration sensor; a shaft stopper that stops the seat panel and shaft in a shock-absorbing elastic fashion when the article still on the seat panel falls and eventually has its middle section fitted in the aperture of the floor plate; and a retainer that normally retains the shaft in position to keep the seat panel flush with the display floor plate while it releases the shaft in response to a detection signal from the vibration sensor to let the seat panel and shaft drop.