PURPOSE: To promote earthquake resistance by bearing a rolling floor on a foundation floor placed on a room floor or on the ground through a spherical rotator.

CONSTITUTION: A rolling floor 4 mounting a bed 5, etc., thereon is borne on a foundation floor 2 provided with a semi- spherical recess 2A through a spherical rotator 3. In the case of a house, etc., the vibration of the foundation floor 2 is absorbed by rotation of the spherical rotator 3. According to the constitution, earthquake resistance can be promoted.