A preliminary study and two main studies were conducted to develop a Post-Traumatic Emotion Scale (PTES) assessing several kinds of emotions which trauma experienced feel after traumas, and to examine its psychometric properties. In a preliminary study, 66 preliminary items were developed on the basis of the previous studies, literature review, and in-depth interviews, and 50 items were then selected using experts’ examination of content validity. In Study 1, exploratory factor analyses(EFAs) were conducted on the responses of the 50 items collected from a sample of trauma experiencers consisting of undergraduate students, fire fighters, police officers, and others(n=232). The results of EFAs revealed an eight-factor structure representing fear, shame, guilt, anger, betrayal, anxiety, alienation, and helplessness. After considering subscale reliability and factor interpretability, a total of 24 items consisting of 3 items loading highly on each factor, were finally selected. In Study 2, confirmatory factor analyses(CFAs) were subjected to the data from an independent sample of 233 trauma experiencers. The results of CFAs indicated that the 8-factor structure of the PTES was replicated in Study 2. Its internal consistency, convergent validity, discriminant validity, and other construct validity were good. In conclusion, these results suggest that the PTES is a reliable and valid instrument to assess various negative emotions related to traumas.