The present invention relates to a pharmaceutical composition for inhibiting melanin generation, which includes: 5-34 parts by weight of Gallic acid, 0.7-2.2 parts by weight of Quercetin, 0.8-3.3 parts by weight of Rutin, and 0.1-0.5 part by weight of Vitamin C. The present invention further provides a pharmaceutical composition for inhibiting melanin generation, which includes a Toona sinensis extract.
