A method for producing high purity terephthalic acid having a step (a) of forming crude terephthalic acid, a dissolution step (b) of dissolving the crude terephthalic acid in a water solvent, a reduction step(c), a crystallization step (d), a separation step (e), a washing step (f) and a drying step (g), which further comprises a recovering step (h) wherein a solid contained in the washing wastewater discharged from the above washing step (f) is recovered and the resultant solid is fed to the above crystallization step (d) or to the above separation step (e), and a reuse step (i) wherein the washing wastewater having been subjected to the recovery of a solid in the above recovering step (h) is used as a solvent for the above dissolution step (b). The above method allows the reuse of a washing wastewater with an apparatus being compact in size, in the production of high purity terephthalic acid.