Patent ID: 7643104

Claim:
A foamed resin sheet that has closed-cells having an average diameter of 0.1 to 5 μm, that has a thickness of 0.1 to 10 mm, that has a cell content of 5 to 90 vol %, that satisfies the following expression (1) in which X (μm) is an average diameter of the closed-cells, Y (vol %) is the cell content and T (mm) is a thickness of the sheet, that has a diffuse reflectance of 80% or more and a reflection haze value of 95% or more and that is for use as a light reflective plate, log 10 ( Y )≧ A ×log 10 ( X )+ B (1) A= 0.037× T+ 0.96 B=− 0.203× T+ 1.21.