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PROBLEM TO BE SOLVED : To provide a method for manufacturing in high productivity an optical fiber having a uniform core NA that enables a solution of a compound containing rare earth elements to be efficiently used.SOLUTION : The method for manufacturing a preform for the optical fiber includes a liquid impregnation step where glass microparticles deposited on the inner peripheral surface of a quartz tube by the MCVD method are impregnated with the solution of a compound containing rare earth elements to add the rare earth elements to the glass microparticles. The method for manufacturing a preform for the optical fiber is characterized in that a means for controlling liquid effluence is installed in the quartz tube and the glass microparticles are impregnated with the solution of a compound containing rare earth elements while the quartz tube is rotated around the center axis in the impregnation step.COPYRIGHT : (C)2010, JPO&INPIT