To protect a building from filling down or inhibit the collapse of the building to a minimum when an earthquake broke out by building up a vibration preventive mechanism which comprises a vibration preventive plate and a ball roller and so forth between foundation concrete and a ground sill.

A steel shaft 4 is provided in the central part of a vibration preventive plate 2 and a damping rubber 19 is internally provided on the lower side of the steel shaft 4 by way of a steel board 18. An adjusting screw 17 is mounted on a projected end of the steel shaft 4 as well and a rubber cover is stretchingly provided on the outer peripheral surface. Furthermore, a ball roller with a bearing 16 is mounted on the tip of the adjust screw 17 by way of an adjusting nut 17, thereby constituting a vibration preventive device main body 1. This vibration preventive device main body 1 is constructed between the foundation concrete 10 and the ground sill 8 where the ground sill 8 is loaded on the ball roller 5. This construction makes it possible to absorb a heavy pressure of a building produced when an earthquake broke out and produce a seismic base isolation.