Abstract: The present invention relates to a fat absorption inhibitor containing a chestnut skin extract, and a food and drink containing that fat absorption inhibitor. The present invention can therefore provide a fat absorption inhibitor, and a food and drink using the same, that can be obtained from waste products following primary use, inhibit increases in lipids such as blood neutral fats by inhibiting absorption of dietary lipids, and in turn are effective in preventing accumulation of lipids, have superior suitability for continuous ingestion without having an impact on flavor, and do not require a complex production process.