Patent ID: 8474574

Claim:
A sound absorbing structure, comprising: a non-air permeable sheet molding object having, on one surface side thereof, a plurality of cavities of recess with bottoms formed by bending so as to be adjacent to each other; and a non-air permeable surface sheet which is layered on the sheet molding object so as to cover open-tops of the plurality of cavities, wherein the surface sheet, being a first membrane oscillation surface, is fixed at outer peripheral sections of the sheet molding object and is not fixed to the sheet molding object in portions between adjacent ones of the plurality of cavities, top surfaces of ridge portions of the sheet molding object between the adjacent ones of the plurality of cavities have one of a same height as and a same gap distance to top surfaces of the outer peripheral sections of the sheet molding object, the sheet molding object is a second membrane oscillation surface that displays a lesser oscillation effect than the surface sheet, and a thickness of the sheet molding object is at least equal to a thickness of the surface sheet so that the sheet molding object displays the lesser oscillation effect than the surface sheet.