Sound insulating structure

A sound insulating structure, comprising, at least:

• a sound insulating member that comprises a sheet-like sheet section and plural projections arranged on one side of the sheet section;
• and
• an adhesive layer arranged on a surface of the sheet section on the opposite side of the side provided with the projections, and
• an adherend to which the sound insulating member is adhered via the adhesive layer,
• wherein
• a storage modulus of the adherend is not less than 500 MPa,
• the adherend includes:
• at least one selected from the group consisting of polyacetal (POM), polyamide (PA), polycarbonate (PC), modified polyphenylene ether (m-PPE), polybutylene terephthalate (PBT), ultrahigh-molecular-weight polyethylene (UHPE), syndiotactic polystyrene (SPS), amorphous polyarylate (PAR), polysulfone (PSF), polyether sulfone (PES), polyphenylene sulfide (PPS), polyether ketone (PEEK), polyimide (PI), polyether imide (PEI), fluororesins (fluorocarbon polymers), and liquid crystal polymers (LCP), and/or
• at least one metal selected from the group consisting of aluminum, iron, stainless steel and alloys thereof,
• the sound insulating structure satisfies the following Formula (1):
• E_glue/I_glue>0.5×(E_membrane/H) (1)
• E_glue (MPa):
• storage modulus of adhesive layer
• I_glue (mm):
• average thickness of adhesive layer
• E_membrane (MPa):
• storage modulus of sheet section and projections
• H (mm):
• average height of sheet section and projections, and
• the E glue (MPa) of the storage modulus of adhesive layer and the E membrane (MPa) of storage modulus of sheet section and projections are measured in a measurement atmosphere having a temperature of 23° C. and a humidity of 50% RH.