Sound insulation sheet, manufacturing method thereof, and sound insulation structure

A sound insulation sheet comprising a concavo-convex structure on at least one surface of a sheet-shaped substrate, wherein

• the concavo-convex structure comprises a plurality of rows of continuous convex protrusions from a sheet surface of the substrate separated by rows of concave portions,
• the rows of continuous convex protrusions are linearly arranged in one direction with respect to one another and do not overlap,
• wherein a shape of a transverse section of the rows of continuous convex protrusions is selected from the group consisting of a square shape, a rectangular shape, a trapezoidal shape, a semicircular shape and an oval shape, and
• wherein a surface density of the substrate is higher than 0.03 kg/m2, a weight ratio of the convex portion to the substrate, represented by (Weight of convex portion/Weight of substrate), is in the range from 0.5 to 30.