PURPOSE: The titled composition low in stress and excellent in moisture resistance and laser markability, prepared by mixing an epoxy resin with a novolak phenolic resin, a specified organic dye, crystalline thermoplastic resin nylon-12 and an inorganic filler.

CONSTITUTION: A mixture formed by mixing an epoxy resin (A) having at least two epoxy groups in the molecule with a novolak phenol(-modified) resin (B) obtained from a phenol and (para)formaldehyde at a molar ratio of the epoxy groups of component A to the phenolic hydroxyl groups of component B of 0.1W10 is mixed with 0.01W10wt% organic dye (C) having at least one metal atom or ion in the molecule (e.g., a compound of formula I), 0.1W21wt% crystalline thermoplastic resin nylon-12 (D) having a group of formula II (wherein n≥1), 25W90wt% inorganic filler (E) (e.g., silica powder) and, optionally, a mold release, a flame retardant, a colorant, a silane coupling agent, etc.