PROBLEM TO BE SOLVED: To provide a compound exhibiting high tyrosinase inhibitory activity. A resorcinol derivative represented by formula I or II and a tyrosinase activity inhibitor containing any of them: wherein n is an integer of 2 to 20 and R is a monosaccharide or an oligosaccharide It represents a sugar residue obtained by removing any one hydroxyl group of a sugar selected from the group, and n′ represents an integer of 6 to 20. [Selection diagram] None【課題】高いチロシナーゼ阻害活性を示す化合物を提供する。【解決手段】式IまたはIIで表されるレゾルシノール誘導体およびそれらのいずれかを含むを含むチロシナーゼ活性阻害剤:式中、nは2~20の整数を表し、Rは単糖およびオリゴ糖からなる群より選択される糖のいずれか1つの水酸基を除いて得られる糖残基を表し、n'は6~20の整数を表す。【選択図】なし