The strength of the parliament in the political system is largely dependent on its professionalism defined by the activity of its deputies. Polish MPs’ level of education is high, often higher than the West European average. The aim of this paper is to find out whether candidates’ education is an electoral criterion, whether voters base their decisions on the prospective deputies’ qualifications and skills confirmed by university diplomas. The study the results of which I present below was carried out between December 2018 and February 2019 as part of the nationwide research project Political preferences. Attitudes – Identifications – Behaviors. It was conducted with the application of the survey questionnaire method.