A peracetic acid type sterilizing composition solution containing peracetic acid, acetic acid, hydrogen peroxide and catalase enzyme, wherein said sterilizing solution has a pH in a range of 2. 6 to 5.0, said catalase enzyme is contained in an amount of 0.1 to 10 µg/ml, the concentration of said peracetic acid is 500 to 10,000 ppm, and the concentration of said hydrogen peroxide is less than 500 ppm. The concentration of the hydrogen peroxide can be efficiently decreased due to the catalase enzyme that is added in small amounts thereby suppressing the bubbling caused by the addition of the catalase enzyme.
