Skin-whitening cosmetic, and method for producing albumin-based compound contained therein

A skin-whitening cosmetic contains an albumin-based compound. The albumin-based compound is albumin or an albumin derivative each having sulfur atoms added thereto. The albumin-based compound has multiple sulfur atoms per one site. A method for producing an albumin-based compound comprises a step of subjecting albumin or an albumin derivative to a sulfide addition reaction. The albumin-based compound can be contained in a skin-whitening cosmetic.