Patent ID: 8624343

Claim:
An epoxy resin composition for an optical semiconductor device, comprising the following ingredients (A) to (E), wherein a total content of the ingredient (C) and the ingredient (D) is from 69 to 94% by weight of the whole of the epoxy resin composition, and the ingredient (E) is contained in an amount satisfying the following numerical formula (1): (A) an epoxy resin; (B) a curing agent; (C) a white pigment; (D) an inorganic filler; and (E) a silane coupling agent, Z 1 × Z 2 X 1 × X 2 + Y 1 × Y 2 × 100 = 1 ∼ 190 ⁢ % ( 1 ) in which X 1 represents a BET specific surface area (m 2 /g) of the ingredient (C); X 2 represents a content (g) of the ingredient (C); Y 1 represents a BET specific surface area (m 2 /g) of the ingredient (D); Y 2 represents a content (g) of the ingredient (D); Z 1 represents a minimum coverage area (m 2 /g) of the ingredient (E); and Z 2 represents a content (g) of the ingredient (E), provided that when a plurality of each of the ingredients (C) to (E) is contained, the designated value is a total value thereof.