PROBLEM TO BE SOLVED: To reduce a wastewater treatment load reducing device externally attached to a new or existing food waste treatment machine to decompose undecomposed residue contained in treated water to reduce the treatment load of a downstream wastewater treatment facility. SOLUTION: A wastewater treatment load reducing device externally attached to the downstream of a new or existing food waste treatment machine 11 to further decompose undecomposed residue contained in the treated water to reduce the treatment load of the downstream wastewater treatment facility. The load reduction device 20 includes a decomposition storage tank 21 that temporarily stores and decomposes a predetermined amount of treated water from the food waste disposer, and the storage tank internally contains the treated water in the storage tank. When the stored amount exceeds a predetermined level, it overflows to maintain the water level in the storage tank at a constant level, and at the same time, the water level in the food waste disposer is made the same in conjunction with the water level, and the water environment in the food waste disposer and the equipment A water level adjusting mechanism 24 is installed to optimize the water level. [Selection diagram] Fig. 1
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