PROBLEM TO BE SOLVED: To provide seasoning liquid having a state suited to be produced or used during concentration, having a proper viscosity even after being diluted, and having excellent flavor and to provide a production method thereof.SOLUTION: There is provided seasoning liquid containing metal ion and alginate. The seasoning liquid has a viscosity after being diluted. The seasoning liquid contains 0.5-20% alginate. The seasoning liquid also contains monovalent metal ion as much as 0.6 mol/L or more in terms of ion concentration. In a production method of the seasoning liquid, monovalent metal ion and alginate are mixed together.SELECTED DRAWING: None