To provide an installation structure of a slide panel for a base isolation free access floor capable of adjusting the size of the slide panel freely, constituting a base isolation panel, a border panel, and the slide panel into the same structure type, installing them at the same levels, increasing the strength of the floor for the slide panel, and preventing it from jumping up when an earthquake occurs.

This slide panel 13 can separate an outer peripheral wall from an inner peripheral wall. The base isolation panel 11, the border panel 12, and the slide panel 13 have the same thicknesses. A wedge block 22 is fixed adjacent to the border panel 12 on a lower floor board 21 fixed on a slide panel supporting means 19 erected on a foundation floor 14. A wedge piece 23 is connected and fixed with/to an end 13a of the slide panel 13. The slide panel 13 is mounted on the lower floor board 21 by contraposing a downward inclined face 23a to an upward inclined face 22a, and an end 13b of the slide panel 13 is supported by a base isolation panel supporting means 16.