Patent ID: 8637593

Claim:
A method for producing a photosemiconductor element mounting board having a recess composed of the bottom face and the wall faces, comprising: a step of forming at least parts of the wall faces of the recess using the thermosetting resin composition comprising (A) an epoxy resin, (B) a curing agent and (D) a white pigment, wherein the viscosity of the (B) curing agent is 1.0-1000 mPa·s at 150° C., as measured with an ICI cone-plate Brookfield viscometer, and the (B) curing agent contains a polyvalent carboxylic acid condensate with a component represented by the following formula (1): where R x represents a divalent organic group derived from hydrogenated terephthalic acid and multiple R x groups in the same molecule are the same or different, R y represents a monovalent organic group and the two R y groups in the same molecule are the same or different, and n 1 represents an integer of 1 or greater.