PROBLEM TO BE SOLVED: To provide composite particles which can sufficiently hold cells thereon for a period of time until an effect of the transplanted cells is developed, and to provide a cell preparation including the composite particles with the cells supported thereon.SOLUTION: The purpose of the invention can be achieved by composite particles each of which includes inorganic particles adsorbed on a surface of a particle composed of an L-lactide-&egr；-caprolactone copolymer, wherein the constitutional molar ratio of L-lactide to an &egr；-caprolactone in the copolymer is approximately 75/25. Furthermore, a cell preparation including cell-supporting composite particles, which includes cell-supporting composite particles produced by supporting cells on the composite particles is provided.【課題】本発明は、移植細胞による効果が得られるまでの期間、十分に細胞を保持することが可能な複合粒子、及び該複合粒子に細胞を担持させてなる細胞製剤を提供することを主な課題とする。【解決手段】Ｌ-ラクチド－ε－カプロラクトン共重合体からなる粒子表面に無機粒子を吸着させてなる複合粒子であって、前記共重合体におけるＬ-ラクチドとε－カプロラクトン共重合体の構成モル比が略７５／２５である複合粒子により実現される。更に、本発明は、前記複合粒子に細胞を担持させてなる細胞担持複合粒子を含む、細胞担持複合粒子を含む細胞製剤を提供する。【選択図】なし
