To surely execute vibration isolation without causing any trouble in maintenance even in the case a vibration isolation device is provided to a small-sized building such as wooden housing, etc.

The vibration isolation device is provided between a building structural body 3 and a foundation 2 bearing the building structural body 3, it is equipped with a fixed member 10 fixed to the foundation 2 and a movable member 20 borne on the fixed member 10 in a movable manner in the horizontal direction, and a movable bearing mechanism 30 for bearing the movable member 20 in a movable manner in the horizontal direction and an elastic confining mechanism 40 energizing the movable member 20 to a vertical axial center direction 10A of the fixed member 10 and confining elastically the horizontal position of the movable member 20 are provided between the fixed member 10 and movable member 20.