A dash insulator (DS) is constructed by layering a front layer (40), a sound absorption layer (50) of a membrane-vibration type and a perforated sound insulation layer (60). A layered body of the sound absorption layer and the perforated sound insulation l...

A dash silencer is constructed by layering a front side layer formed from a porous material, an intermediate layer constructed by a film structure body and a rear side layer. The rear side layer has upper and lower side layer portions which are formed from...