The present invention relates to a reducer having an oil leakage prevention structure, wherein the internal and external structure of the reducer is improved so that oil leakage which occurs during operation of the reducer can be efficiently prevented. To this end, the present invention provides a reducer having an oil leakage prevention structure, the reducer comprising: an input reduction unit which is coupled to the inside of the housing in the manner of a cartridge, is connected to a motor through an input shaft, and has a pinion gear formed in a lower portion thereof; an output reduction unit which has a ring gear engaging with the pinion gear and is connected to a rotary machine through an output shaft to transmit the reduced rotation to the rotary machine; and a main oil chamber unit which passes through the output shaft from an upper portion of the output reduction unit and allows oil inside the housing to flow in and out, thereby preventing the oil from leaking.
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