PROBLEM TO BE SOLVED: To obtain both water for extracting a coffee component, capable of extracting the effective coffee component from roasted coffee beans in a short time as much as possible and a tasty coffee component extracted solution by extracting the coffee component using the water for extracting the coffee component. SOLUTION: Alkali water having pH 8 to pH 11 formed by electrolysis is used as water for extracting a coffee component. A coffee component extracted solution having pH 5.0-5.2 is obtained by extracting the coffee component from coffee beans by using the water for extracting the coffee component.