PROBLEM TO BE SOLVED: To provide a silencing mat which does not form a void between a construction surface and the silencing mat even when the construction surface is uneven and is capable of constructing the silencing mat even after the preservation treatment on the construction surface and is excellent in workability. SOLUTION: A silencing mat 2 is mainly composed of a mat main body 6 formed with a non-adhesive rubber and adhesive rubber and is provided with an adhesive layer 10 bonded with the rear surface of the mat main body 6. In this case, the adhesive layer 10 be favorably composed of a first adhesive layer, a second adhesive layer and a shape holding material sandwiched between these rubber layers. The adhesive layer comprises a non-vulcanized butyl rubber while the shape holding material comprises a polyethylene net.
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