PROBLEM TO BE SOLVED: To provide dietary fiber derived from used tea leaves that hardly affect the flavor and taste of a beverage or a food product even when mixed with the beverage or food product, and a method for producing the same.SOLUTION: A method for producing dietary fiber derived from used tea leaves, comprises: step S11, S111 for applying alkali treatment to used tea leaves with alkali solution comprising hydroxide; step S12, S112 for neutralizing the hydroxide with acid; and step S13, S114 for recovering dietary fiber from the neutralized treatment liquid.SELECTED DRAWING: Figure 1【課題】飲料又は食品と混合されても、この飲料又は食品の香り及び味へ影響を与え難い茶殻由来の食物繊維、及びその製造方法の提供。【解決手段】水酸化物を含むアルカリ溶液を用いて茶殻をアルカリ処理するステップS11,S111と、酸を用いて前記水酸化物を中和するステップS12,S112と、前記中和された処理液から食物繊維を回収するステップS13,S114と、を含む茶殻由来の食物繊維の製造方法。【選択図】図1