The invention relates to a use of astaxanthin for inhibiting or treating melanoma. Accordingly, the astaxanthin can be used in manufacturing pharmaceuticals or health products to inhibit proliferation, metastasis, migration and invasion of melanoma cells.本發明有關於蝦紅素(astaxanthin)於抑制或治療黑色素瘤(melanoma)的用途,藉此蝦紅素可用於製備抑制黑色素瘤細胞增生、轉移(metastasis)、遷徙(migration)與侵入(invasion)之醫藥品或保健品。