To provide a method for preserving an ester wax without changing physical properties such as an acid value, a hydroxyl value or viscosity even when transportation or storage is carried out over a long period of time.

The method for preserving the ester wax represented by general formula (1) (wherein, R1 and R2 are each an alkylene group which may have a 2-24C straight-chain substituent; and n is an integer of 1-25) comprises regulating the amount of moisture contained in the ester wax to 0.5 wt.%.