PROBLEM TO BE SOLVED: To provide a method for determining the concentration of a peracetic acid preparation, which can easily and quickly determine the concentration of a peracetic acid preparation with high accuracy. SOLUTION: A light-transmissive container 12 containing a target solution obtained by adding a reagent of a predetermined concentration to a solution of a peracetic acid preparation and a plurality of color swatches 15a to 15f are arranged side by side, and the peracetic acid preparation is used for food. The concentration of the peracetic acid preparation is in the range of 50 mg / L to 500 mg / L, and by visually identifying the transmitted light transmitted through the container and one of the plurality of color samples, A method for determining the concentration of a peracetic acid preparation capable of determining the concentration of an acetic acid preparation, wherein a plurality of color samples exhibit a color corresponding to each of the plurality of target solutions containing a solution of a peracetic acid preparation having a different concentration, The plurality of target solutions corresponding to these color samples exhibit an absorbance of 1.5 with respect to light in different wavelength ranges. [Selection diagram] Fig. 1
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