Provided is a stem-cell differentiation and induction promoter, which comprises as an effective ingredient a cyclohexenone long-chain alcoholic derivative represented by the formula (1):[wherein, R?1, R2 and R3¿ each independently represents a hydrogen atom or a methyl group and X represents a linear or branched C10-28 alkylene or alkenylene group]. Since the cyclohexenone long-chain alcoholic derivative according to the present invention promotes differentiation-induction of stem cells into cells expressing a specific biological function, a medicament comprising the derivative is useful as a preventive or remedial drug for diseases such as nervous diseases, bone diseases, circulatory diseases and myopathy, caused by the degeneration of tissues or cells or cell death.