To provide a composition for hard tissue repair excellent in eluted amount of an antibacterial agent, and a kit for hard tissue repair.SOLUTION: There are provided a composition for hard tissue repair containing a monomer (A), a polymer (B), a polymerization initiator (C), and an antibacterial agent particle (Y) having volume average particle diameter of 15 μm or more, and a kit for hard tissue repair having a member in which each component of the monomer (A), the polymer (B), the polymerization initiator (C) and the antibacterial agent particle (Y) contained in the composition for hard tissue repair is divided into 3 or more with any combination and accommodated.SELECTED DRAWING: None【課題】抗菌薬の溶出量に優れた硬組織補修用組成物及び硬組織補修用キットを提供する。【解決手段】モノマー（Ａ）、重合体（Ｂ）、重合開始剤（Ｃ）、及び、体積平均粒径１５μｍ以上の抗菌薬粒子（Ｙ）を含む硬組織補修用組成物；並びに、この硬組織補修用組成物に含まれるモノマー（Ａ）、重合体（Ｂ）、重合開始剤（Ｃ）及び抗菌薬粒子（Ｙ）の各成分が、任意の組合せで３つ以上に分割されて収容された部材を有する硬組織補修用キット。【選択図】なし
