To provide an inexpensive earthquake-proof structure of a building for reducing the vibration of the entire building including a building of a first story without horizontally moving a building main body on a ground-side foundation.

In this earthquake-proof structure, the building main body 2 is built on a foundation 1. Approximately vertical materials made of steel are placed on the foundation 1, and lateral materials 13 are placed on upper parts of the vertical materials 12. The vertical materials 12 are reinforced by oblique materials of earthquake-proof structures placed over from the vertical material 12 to the lateral material 13 or the adjacent vertical materials 12.