PROBLEM TO BE SOLVED: To provide a reprogramming method for dedifferentiation of somatic cells to stem-like cells.SOLUTION: Provided is a method for achieving dedifferentiation of a somatic cell into a cell having stem cell characteristics, in particular, a cell having multipotency, by introducing into the somatic cell an RNA encoding a factor that elicits dedifferentiation of somatic cells; and culturing the somatic cell for dedifferentiation. In certain embodiments, the RNA is derived from an undifferentiated cell and the undifferentiated cell is an embryonic stem cell or an adult stem cell.【課題】分化した体細胞を幹様細胞に脱分化させるための再プログラミングの方法の提供。【解決手段】体細胞の脱分化を誘導する因子をコードするRNAを体細胞中に導入し、その体細胞を培養して細胞を脱分化させることにより、幹細胞特性、特に多能性を有する細胞への、体細胞の脱分化を達成するための方法。前記RNAが未分化細胞に由来し、前記未分化細胞が、胚性幹細胞又は成体幹細である方法。【選択図】なし