An object of the present invention is to provide an efficient method for producing a guar gum degradation product. A method for producing a guar gum degradation product, comprising: A reaction step of removing galactose of guar gum with an enzyme to produce a guar gum degradation product, wherein in the reaction step, the guar gum, the enzyme, and water are mixed to prepare a pre-reaction mixture, Wherein the pre-reaction mixture has a concentration of the guar gum of 20 mass percent or more. Figure 1

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