| abstract |
A resin sheet having at least a three-layer structure composed of a thermoplastic resin layer for forming the foam layer 11 and a thermoplastic resin layer for forming the non-foam layer 12 is integrally formed, At least one foam layer of the foam sheet has a non-foam layer on both sides thereof, and the foam layer is made of a thermoplastic resin having a different composition from the non-foam layer, The average diameter of the bubbles 13 having a diameter of 10 mu m or less and the density of the foam layer of the foam layer is 1.0 x 10 6 pores per square or more and the thickness of the non- / ≪ / RTI > and the ratio of the entire non-foam layer in the entire foam sheet is 10% by mass or more. |