PROBLEM TO BE SOLVED: To provide a protein-containing beverage that is free from aggregation, has a uniform appearance, and has a reduced astringent taste.SOLUTION: A protein-containing beverage contains protein of 0.2 mass% or more and tannin of 1 ppm or more, and cellulose of 0.01 mass% or more, and has a loss tangent tanδ of 3 or less.SELECTED DRAWING: NoneCOPYRIGHT: (C)2019,JPO&INPIT【課題】凝集がなく均一な外観を呈し、且つ渋味が抑制されたタンパク質含有飲料の提供。【解決手段】タンパク質含有飲料は、タンパク質を0.2質量%以上、タンニンを1ppm以上、及びセルロースを0.01質量%以上含有し、且つ、損失正接tanδが3以下である。【選択図】なし