PROBLEM TO BE SOLVED: To provide a judging device for judging the degree of achievement of a predetermined process with high accuracy. SOLUTION: A judging device for judging the achievement level of the predetermined process by a test paper having a color change area whose color changes in accordance with the achievement level of the predetermined process is a measuring area including the color change area of the test paper. Measuring means for measuring the optical characteristic value, for each of the plurality of achievement degree of the predetermined processing, holding means for holding the determination information indicating the relationship between the area of the color change region in the measurement region and the optical characteristic value, The determination means determines the degree of achievement of the predetermined processing based on the determination information and the optical characteristic value of the measurement area of the test paper measured by the measurement means. [Selection diagram] Fig. 6【課題】高い精度で所定の処理の達成度を判定する判定装置を提供する。【解決手段】所定の処理の達成度に応じて色が変化する変色領域を有する試験紙により前記所定の処理の達成度を判定する判定装置は、前記試験紙の前記変色領域を含む測定領域の光学特性値を測定する測定手段と、前記所定の処理の複数の達成度それぞれについて、前記測定領域における前記変色領域の面積と前記光学特性値との関係を示す判定情報を保持する保持手段と、前記測定手段が測定した前記試験紙の前記測定領域の前記光学特性値と、前記判定情報と、に基づき、前記所定の処理の達成度を判定する判定手段と、を備えている。【選択図】図６
