PROBLEM TO BE SOLVED: To provide an oligomer obtained by polymerization of two or more epigallocatechins, and a manufacturing method thereof.SOLUTION: The oligomer is a compound represented by the general formula (VI) in the figure, where R1 to R23 are each a phenolic hydroxy group protecting group or hydrogen, and n is an integer from 1 to 10 inclusive. The manufacturing method comprises fusing a compound represented by the general formula (I) with a compound represented by the general formula (V-1) or (V-2) in the figure.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2019,JPO&INPIT【課題】エピガロカテキンが２つ以上重合したオリゴマー及びその製造方法の提供。【解決手段】オリゴマーは、下記一般式（ＶＩ）（式中、Ｒ１～Ｒ２３はフェノ－ル性水酸基の保護基または水素、ｎは１以上１０以下の整数）で表される化合物。その製造方法は、下記一般式（Ｉ）で表される化合物を、下記一般式（Ｖ－１）または（Ｖ－２）で表される化合物と縮合させる工程を含む。【選択図】図１
