PROBLEM TO BE SOLVED: To provide a cellular transition or invasion inhibitor having inhibiting activity against cellular transition or invasion, and to provide a composition for inhibiting cellular transition or invasion.SOLUTION: Disclosed is a composition for inhibiting cellular transition or invasion which contains a cellular transition or invasion inhibitor with an antibody obtained by immunizing nonhuman mammal with polypeptide consisting of 14-22 amino acid residues comprising an amino acid sequence expressed by SEQ ID NO: 1, as an active ingredient； the antibody, and pharmaceutically acceptable carrier.【課題】細胞の転移又は浸潤に対して阻害活性を有する細胞の転移又は浸潤抑制剤及び細胞の転移又は浸潤抑制用組成物を提供する。【解決手段】配列番号１で示されるアミノ酸配列を含む１４～２２アミノ酸残基からなるポリペプチドを非ヒト哺乳動物に免疫して得られた抗体を有効成分とする細胞の転移又は浸潤抑制剤；前記抗体と、医薬的に許容可能な担体と、を含む、細胞の転移又は浸潤抑制用組成物。【選択図】図２
