Monomer (a),Polymer (b),Polymerization initiator (c)AndContains a contrast agent (x) having a volume average particle size of 3. Mu. M or more.Excellent in penetration to the adhesive such as sponge boneComposition for hard tissue repair excellent in adhesion with the adhesive;AndMonomer (a) contained in this hard tissue repair compositionPolymer (b),Polymerization initiator (c)AndEach component of contrast agent (x) isA hard tissue repair kit having a member accommodated in three or more parts in any combination is disclosed.モノマー(A)、重合体(B)、重合開始剤(C)、及び、体積平均粒径3μm以上の造影剤(X)を含み、海綿骨等の被接着体への侵入性に優れ、被接着体との密着性に優れた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、造影剤(X)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が開示される。