PURPOSE: To minimize compressive deformation and reduce lightweight impact noise by forming a floor base material an elastic sheet material having a determined void and a plate material on which uneven surfaces are formed to disperse impact force, and laminating this base material on a woody floor material layer.

CONSTITUTION: A soundproof floor material is formed out of a woody floor material layer 1 and a floor base material 2 on the lower surface thereof in which an unevenly formed plate material 4 is sandwiched between elastic sheet materials 5. The elastic sheet material 5 is bonded to an elastic fibrous sheet by an elastic resin having a resin solid content of less than 50% to form a thickness of about 2-10mm having a percentage of void of 50-80% A fibrous material such as polyester is braided and spirally formed to give resilient performance. Uneven surfaces are formed on the plate material 4 formed out of a hard vinyl having a thickness of about 3-20mm to disperse impact force. This is sandwiched between the elastic sheet materials 5 to form a sandwiched floor base material 2, which is then laminated on the lower surface of the woody floor material layer 1.