The subject of the present invention is to provide a novel medical application of peptides. The solution of the present invention is a pharmaceutical composition for the treatment or prevention of retinitis pigmentosa, which comprises a peptide comprising the amino acid sequence represented by SEQ ID NO: 30 and inhibiting protease activity.本發明之課題為提供一種胜肽之新穎醫藥用途。本發明之解決手段為用於視網膜色素變性(retinitis pigmentosa)之治療或預防的醫藥組成物，其包含一種包含序列識別號30所表示的胺基酸序列且抑制蛋白酶活性之胜肽。
