PROBLEM TO BE SOLVED: To provide a base-isolated floor structure that saves the trouble and cost for attachment or detachment of the whole or a part thereof without reference to the size and shape of a room of a building structure where the base-isolated floor structure is installed not an installation range of the room, and has its installation layout easily changed even after the installation.;SOLUTION: The base-isolated floor structure is constituted by mutually connecting a plurality of base-isolated structures 42 which each have a base-isolated part 60 thereunder and adjoin one another in horizontal directions. The trouble and cost for attachment or detachment of the whole or a part thereof can be saved without reference to the size and shape of the room of the building structure where the base-isolated floor structure is installed nor the installation range of the room, and its installation layout can be easily changed even after the installation.;COPYRIGHT: (C)2013,JPO&INPIT
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