Disclosed are: a composition for hard tissue repair with excellent penetrability to an adherend such as a cancellous bone and excellent adhesion to an adherend, which comprises a monomer (A), a polymer powder (B) comprising 54% by mass or more of a polymer powder (b1) having a volume mean particle diameter of 27 to 80μm and a polymerization initiator (C)； and a kit for hard tissue repair having members in which the components of the monomer (A), the polymer powder (B) and the polymerization initiator (C) contained in the composition for hard tissue repair are encased in three or more divided groups in an optional combination.本發明係揭示含有單體(A)、含體積平均粒徑27~80μm之聚合體粉末(b1)54質量%以上之聚合體粉末(B)及聚合起始劑(C)，且對海綿骨等被接黏體之侵入性優越，與被接黏體間之密黏性優越的硬組織修補用組成物；以及具有將此硬組織修補用組成物中所含之單體(A)、聚合體粉末(B)及聚合起始劑(C)之各成分，依任意組合分割為3個以上而收容的構件的硬組織修補用套組。
