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 3 µm 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 this composition for hard tissue repair are encased in three or more divided groups in an optional combination.
