PROBLEM TO BE SOLVED: To provide a cell-containing composition capable of suppressing the outflow of cells after transplantation and improving the survival rate of the cells.SOLUTION: The present invention provides a composition which comprises: any of bone marrow stromal cell-derived neural precursor cells, bone marrow stromal cell-derived Schwann cells, or bone marrow stromal cell-derived skeletal muscle cells; and a biocompatible polymer.SELECTED DRAWING: None【課題】移植後の細胞の流出を抑制でき、かつ細胞の生存率を向上できるような、細胞含有組成物を提供すること。【解決手段】 骨髄間質細胞由来神経前駆細胞、骨髄間質細胞由来シュワン細胞及び骨髄間質細胞由来骨格筋細胞の何れかの細胞、及び生体適合性高分子とを含む組成物。【選択図】なし