The present specification is intended to develop a new substance which exhibits a skin whitening effect and to apply the new substance to a composition for skin whitening, provides a new composition for skin whitening and a new kit for skin whitening which contain TNFSF14 protein and a polynucleotide encoding the TNFSF14 protein and a method of using the same, and thus can contribute to the market expansion and industry development related to the skin whitening field.
