PURPOSE: To make it possible to carry out speedily and easily construction work of floor construction using laying floorings.

CONSTITUTION: First of all, plate-like foamable resin bodies are arranged on a constructing formation level 21, bonding tapes 22 having one surface as an adhesive one and the other surface as a surface fastener are stuck on the plate- like foamable resin bodies 20 at specific intervals. After that, a specific number of unit plates are joined with each other in a specific state of arrangement on the same place, and a required number of panel-shaped laying floorings 10 formed of joined clothe member 17 interlocked with the surface fasteners fixed to the rears of the unit plates are constructed on the plate-like foamable resin bodies 20 while joining each other. At that time, resin films 25 are temporarily put between the bonding tapes 22 and laying floorings 10, and the interlock of the joined cloth member 17 with the surface fastener is avoided.