Extended X-ray absorption fine structure measurement was performed using the sample containing only YC82 as a metallofullerene. The spectrum measured on the K-edge of the Y showed that a Y atom has two neighboring carbons at distance of 2.41 Å. This suggests that the Y atom is located on the double bond of the carbon cage. This bond structure corresponds to one of the stable candidates predicted by molecular orbital calculation, which accounts for the charge transfer interaction in Y3+C823-as has already been confirmed by ESR measurements.