PROBLEM TO BE SOLVED: To determine the degree of achievement of processing regardless of the mode of color change in a discolored area of a test paper. A determination device for determining the degree of achievement of the predetermined processing by a test paper having a color-change area whose color changes in accordance with the degree of achievement of the predetermined processing measures a color value of the color-change area of the test paper. Measuring means, a plurality of reference color values indicating a plurality of colors of the color change area corresponding to a plurality of achievement levels of the predetermined process, and two sets of two neighboring achievement levels of the plurality of achievement levels. Holding means for holding a threshold value, a measured color value of the discolored area of the test paper measured by the measuring means, a plurality of reference color values, and a set of two adjacent achievement levels of the plurality of achievement levels. Determination means for determining the degree of achievement of the predetermined processing based on the threshold values corresponding to the respective threshold values. [Selection diagram] Figure 4【課題】試験紙の変色領域の色の変化の態様に拘わらず処理の達成度を判定する。【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の色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に対応する前記変色領域の複数の色を示す複数の基準色値と、前記複数の達成度の隣接する２つの達成度の組それぞれに対応する閾値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変色領域の測定色値と、前記複数の基準色値と、前記複数の達成度の隣接する２つの達成度の組それぞれに対応する閾値と、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、を備える。【選択図】図４
