To obtain detailed information on the metastable and the equilibrium phases in rapidly solidified Al-(Fe, Ce) alloys, analysis of X-ray diffraction pattern has been carried out. It has been found that the metastable phase formed in Al-Fe alloys including up to 6w% Fe is Al_6Fe and the equilibrium phase is Al₃Fe. Any X-ray diffraction peak corresponding to the equilibrium phase Al_(13)Fe₄has not been observed during aging. In Al-4wt% Fe alloy, which is ribbon shape with thickness less than 70㎛, aged at 400℃ for lh after rapid solidification, unidentified phase has been found. In Al-4wt% Ce alloy, only X-ray diffraction peak corresponding to the equilibrium phase, Al₄Ce has been observed. It has been found that the metastable phase Formed in Al-Fe-Ce alloys including up to 6wt% Fe and 4wt% Ce is Al_6Fe and the equilibrium phases are Al₃Fe and Al_(10)CeFe₂.