This article details the process of design, validation and application (N = 501) of an ad-hoc questionnaire that measures Peruvian teachers' knowledge, attitudes, and reasoning in training on media education. With regards to the method, several psychometric validation techniques were applied and the results were analyzed using descriptive statistics. The results showed a high level of internal coherence and confidence in the construct. Limited knowledge of the subject was found in the participants, without observing significant differences between the variables, and a very positive assessment of its importance and urgency. To conclude, media education is transversal to different classifications and interest in it is homogeneous throughout the teaching staff in training.