PROBLEM TO BE SOLVED: To select low-molecular-weight compounds which are effective in inducing differentiation of a mesenchymal stem cell into a hepatocyte and to provide a safe differentiation-inducing method having excellent efficiency of differentiating a mesenchymal stem cell into a hepatocyte.SOLUTION: A cell sheet is obtained by exposing a mesenchymal stem cell for a predetermined period to a compound having Wint/β-catenin signal pathway inhibitory action, as represented by formula (1), and thus inhibiting the Wint/β-catenin signal pathway of the mesenchymal stem cell.SELECTED DRAWING: Figure 15【課題】間葉系幹細胞から肝細胞への分化を誘導する有効な低分子化合物を選択し、間葉系幹細胞から肝細胞への分化効率に優れる安全な分化誘導法の提供。【解決手段】Wint/βカテニンシグナル経路抑制作用のある式(1)で表される様な化合物に間葉系幹細胞を所定の期間暴露し、間葉系幹細胞のWint/βカテニンシグナル経路を抑制することにより得られた細胞シート。【選択図】図15