The present invention relates to a skin whitening cosmetic composition comprising pachymic acid separated from white poria as an effective component. More particularly, the present invention relates to a skin whitening cosmetic composition comprising skin whitening substances having excellent effects of suppressing the synthesis of melanin through an anti-inflammatory effect. The skin whitening cosmetic composition of the present invention comprises 0.001-5 wt% of pacymic acid as an effective component based on the total weight of the composition.COPYRIGHT KIPO 2016본 발명은 백복령으로부터 분리한 Pachymic acid를 유효성분으로 함유하는 미백 화장료 조성물에 관한 것으로, 구체적으로 항염 효과를 통해 멜라닌 합성 억제가 뛰어난 미백 물질을 함유하는 미백 화장료 조성물에 관한 것이다.