PROBLEM TO BE SOLVED: To obtain a melanin formation inhibitor which consists of a solvent extract from a specific part or the whole grass of a specific plant and is used by blending with cosmetics, medicines, quasi-drugs or foods, and to provide its use. SOLUTION: This melanin formation inhibitor contains a solvent extract from a specific plant, e.g. botanical name: Amomum cardamomum Willd (Indonesian name: Tapol), botanical name: Piper nigrum L. (Indonesian name: Lada hitam), botanical name: Punica granatum L. (Indonesian name: Delima putih), botanical name: Ligustrum glomeratum B1. (Indonesian name: Ganti), botanical name: Terminaliabelerica Roxb. (Indonesian name: Jaha), botanical name: Rheum officinale Baillom (Indonesian name: Klembak), botanical name: Myristica fragans Houtt. (Indonesian name: Kulit pala), etc.