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 (B), a polymerization initiator (C) and a contrast medium (X) having a volume mean particle diameter of 3μm or more； and a kit for hard tissue repair having members in which the components of the monomer (A), the polymer (B), the polymerization initiator (C) and the contrast medium (X) 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)、聚合體(B)、聚合起始劑(C)及體積平均粒徑3μm以上之造影劑(X)，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(B)、聚合起始劑(C)及造影劑(X)之各成分，依任意組合分割為3個以上而收容的構件之硬組織修補用套組。
