Problem to be solved: to provide an anti cell and a method of use to target B cell maturation antigen.Solution: antib fine, including a heavy chain variable region containing CDR1, CDR2, and CDR3, each containing an amino acid sequence comprising a specific sequence; and a light chain variable region containing CDR1, CDR2, and CDR3, each containing an amino acid sequence comprising a specific sequence An endometrial antigen (BCMA) antibody or its antigen binding part.Use of the anti BCMA antibody or its antigen binding fragment in the manufacture of pharmaceuticals for treating tumors in the subject.No selection【課題】B細胞成熟化抗原を標的化する抗体および使用の方法の提供。【解決手段】それぞれ特定の配列からなるアミノ酸配列を含む、CDR1、CDR2、およびCDR3を含む重鎖可変領域;ならびにそれぞれ特定の配列からなるアミノ酸配列を含む、CDR1、CDR2、およびCDR3を含む軽鎖可変領域を含む、抗B細胞成熟化抗原(BCMA)抗体またはその抗原結合性部分。対象における腫瘍を処置するための医薬の製造における、前記抗BCMA抗体またはその抗原結合性断片の使用。【選択図】なし