The purpose of this study was to construct and validate the instrument "Assessment scale of the constitution of professional identity of the bachelor in Physical Education" (EAECP). As proposed by Pasquali (2010), the process was structured in five steps: Construction of the issues; Validity of content; Reproducibility and reliability of instruments; Validation of the construction, and Evaluation of the internal consistency of the instrument. Based on the theory of professional representation, 44 elements were developed, of which 11 were eliminated due to redundancy of ideas. In the content validity step, eight other questions were eliminated, resulting in 25 questions. Confirmatory Factorial Analysis showed adequate suitability after the exclusion of eight more questions, and the achievement of five correlations. The internal consistency of the instruments presented a good level. The results show that the questionnaire, composed of 17 questions distributed in the dimensions have satisfactory psychometric properties that are adequate to analyse the contribution level perceived by students about the practice for the construction of professional identity.