The subject matter of this article is discussing legal concepts of Ignacy Matuszewski in the interwar period. In the core of the camp of adherents of Piłsudski he was one of the few people interested in the economic issues of the state, what is more he belonged to a small circle of its representatives who themselves formulated original political concepts of the Republic of Poland. Matuszewski’s output as a publicist formed not only the projects of a constitution, but also discussions concerning the shape and functioning of specific constitutional bodies. It was demonstrated that Matuszewski – the proponent of strong power of the head of the state, at the same time was characterised by a pragmatic attitude to system issues. He was against the view that only with the help of adequately enacted law the intended goal could be unfailingly achieved. The article contains the analysis of Matuszewski’s constitutional views from which it could be deduced that he was the advocate of a two-chamber parliament and of effective rule of the Council of Ministers. The study brings closer the achievements of Matuszewski in the sphere of law, which are in our times practically unknown.