In the present study, it is aimed to develop a valid and reliable scale for determining value-eroding behaviors of teachers, hence their values of judgment. The items of the "Value-eroding Teacher Behaviors Scale" were designed in the form of 5-point likert type rating scale. The exploratory factor analysis (EFA) was conducted to determine the construct validity of the scale. Afterwards, the validity of the structure obtained through EFA was tested by using the confirmatory factor analysis (CFA). To determine the reliability of the scale, the Cronbach's alpha was calculated, and an item analysis was performed based on the corrected item total correlation. Based on the findings obtained from the validity and reliability studies of the scale, it can be said that the scale is a valid and reliable measuring tool to be used for measuring teachers' value-eroding behaviors.