Provided is a stable pharmaceutical composition comprising an anti-human α9 integrin antibody, capable of inhibiting the formation of multimers, degradants, insoluble foreign matters, or insoluble microparticles. The pharmaceutical composition comprises a pharmaceutically acceptable buffer, and has a pH of 5.0 to 7.0.本發明係提供由抑制聚合物、分解物、不溶性異物或不溶性微粒子的生成,含有抗人類α9整合素抗體所構成之穩定的醫藥組成物。前述醫藥組成物係含有製藥學容許的緩衝劑而成,pH為5.0~7.0。