(EN) A process for polyester production improved in color tone and polymerizability, in which side reactions are inhibited from occurring during polycondensation. The process for polyester production comprises (A) a step in which a dicarboxylic acid or dialkyl dicarboxylate and a diol are subjected as major starting materials to esterification or transesterification in the presence of a catalyst to produce an oligomer having a degree of esterification or transesterification of 90% or higher and (B) a polycondensation step in which the oligomer is continuously condensation-polymerized in a molten state in reaction tanks disposed in multistage arrangement, and is characterized in that the polycondensation step (B) satisfies the relationship TMAX > T(&ohgr;) wherein TMAX (°C) is the internal temperature of the tank having the highest internal temperature and T(&ohgr;) (°C) is the internal temperature of the final tank.
