The objective of this study was to design and validate a measuring instrument to evaluate the performance of university professors. The Evaluation of Teaching Performance (CEID [Centro de Estudios e Investigaciones Docentes (Center for Teaching Studies and Research)]) questionnaire was administered to 1297 university students. Various factor analyses were performed (exploratory and confirmatory), of the internal consistency, descriptive statistics, and correlation of all of the items. The data obtained confirmed a suitable psychometric structure for the CEID scale, which was made up of three dimensions (planning, development, and result). It is therefore concluded that it is a valid and reliable instrument for evaluating the performance of a university professor.