A hard tissue repair composition which includes (A) a monomer, (B) a polymer powder containing 54 mass% or more of a polymer powder (b1) having a volume average particle diameter of 27-80μm, and (C) a polymerization initiator, and which has excellent penetrability into an adherend such as cancellous bone and excellent adhesion to the adherend； and a hard tissue repair kit which has a member in which are housed, divided into 3 or more in an arbitrary combination, the components (A) the monomer, (B) the polymer powder and (C) the polymerization initiator contained in the hard tissue repair composition.
