Disclosed in the present specification is a skin whitening composition comprising a Pseudoalteromonas peptidolytica strain, a lysate thereof, a cultured product thereof or an extract of the strain, lysate or cultured product as an active ingredient. Disclosed in the present specification is a Pseudoalteromonas peptidolytica strain SNC 130, having an accession number of KCCM12050P, which has a skin whitening function.