PROBLEM TO BE SOLVED: To provide a novel resveratrol derivative that is stronger in metabolism activation potency than resveratrol, a method for producing the novel resveratrol derivative efficiently and safely, and a metabolism activator as well as a food, a pharmaceutical, and a quasi drug comprising the novel resveratrol derivative.SOLUTION: The present invention provides a novel resveratrol derivative represented by formula (1) or a pharmacologically acceptable salt thereof, and a metabolism activator as well as a food, a pharmaceutical, and a quasi drug comprising the novel resveratrol derivative.SELECTED DRAWING: None