PURPOSE: To avoid the generation of problems such as the generation of the sounds caused by the curing of adhesives by sticking the fitting convex section of a hard floor material to the fitting recessed section of the floor material adjacent to it and laying them on the cushion layer on a floor backing.

CONSTITUTION: A fitting convex section 2 and fitting recessed section 3 are formed in a part of the peripheral section of the hard floor material 1 comprising ligneous base plates 7 and 7, in the recess sections of which urethane rubbers are charged, and a decorative plate layered on the upper section of the ligneous base plate 1 and the rest of the periphery respectively. On the cushion layer 8 on a floor backing 4, the fitting convex section 2 of the hard floor material 1 is laid being stuck to the fitting recessed section 3 of the floor material adjacent to the fitting convex section 2 through adhesives 5 of low viscosity. The adhesives 5 of low viscosity must be applied without unevenness so that the air tightness of a joint section may not be spoiled, and so that the adhesive film after sticking may have flexibility. By this constitution, the generation of problems caused by the curing of the adhesives and the generation of the sounds caused by stepping can be avoided.