It is intended to provide seasoned tofu which has a favorable mouthfeel in "hardness" and "brittleness" and has been evenly seasoned throughout, and a method of producing the same. Seasoned tofu is produced by heating and coagulating seasoned soymilk containing soybean milk, a seasoning providing sodium ion and/or potassium ion and glucono delta-lactone as a coagulant wherein the concentration of soybean protein is 5.5% by mass or more and 8.5% by mass or less, the total concentration of the sodium ion and/or potassium ion is 0.05 mol/L or more and 0.154 mol/L or less and the concentration of the glucono delta-lactone is 0.4% by mass or more and 0.9% by mass or less.