NOVELTY - The method involves connecting sublimation tube (13) with vacuum pump (11) at other terminal of piping (12). A sublimation portion (14) is provided in closed terminal side in sublimation tube, and sublimation purification object sample is arranged. Pressure in sublimation tube in sublimation purification process is calculated using maximum pressure in sublimation tube which is 50x 10-3 Pa or less, and relationship between maximum pressure and pressure in sublimation tube at time of completion of sublimation, which is obtained using predetermined formula.    USE - Sublimation purification method for purifying target material such as organic electroluminescent (EL) material for light-emitting device, organic EL device, organic transistor, organic sensor and organic solar cell.    ADVANTAGE - The sublimation efficiency of the sublimation purification object sample is improved. Since the residual ratio of the sublimation residue is reduced, and the specific grinding process is provided to the crude portion, the pressure change in the sublimation tube is made in specific range. Hence the yield of the sublimation purification is improved.    DETAILED DESCRIPTION - The method involves closing one terminal of piping. A collection portion (15) of sublimate is an area from the sublimation portion to a connection portion. The sublimation purification object sample is grind by a particle size of 20 micrometers or less without using a dispersion medium. The particle size of the sublimation purification object sample is 10 micrometers or less. The sublimation purification object sample is grind by a dry-type jet mill. A mass decreasing rate is 2% or more, when the sublimation purification object sample is maintained at sublimation temperature in inert gas atmosphere and under a normal pressure for 5 hours. The mass decreasing rate is 10% or more, when the sublimation purification object sample is maintained at sublimation temperature in inert gas atmosphere and under normal pressure for 5 hours.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the sublimation purification apparatus.    Vacuum pump (11)    Piping (12)    Sublimation tube (13)    Sublimation portion (14)    Collection portion (15)