The invention provides a resin powder composition for slush molding which can give slush-molded articles more excellent in the resistance to moist-heat aging. The invention relates to a resin powder composition for slush molding which is characterized by comprising as the main component a thermoplastic polyurethane resin powder, preferably a thermoplastic polyurethane elastomer powder, and containing a poly- carbodiimide prepared by polymerizing tetramethylxylylene diisocyanate, preferably an alkoxy-terminated one having a number-average molecular weight of 500 to 30,000.