PURPOSE: To obtain a resin composition which produces a coating layer excellent in appearance such as gloss, quality and adhesion to molding materials in in- mold coating by incorporating respectively specific thermostting resin and finely divided powder of the cured product.

CONSTITUTION: This resin composition comprises one or more thermosetting resins selected from unsaturated polyester resins, urethane acrylate resins and epoxy acrylate resins (e.g. an unsaturated polyester resin prepared from maleic anhydride, isophthalic acid and propylene glycol) and a finely divided powder of the cured product of one or more of the thermosetting resins.