The author analyses the dynamics of the Polish party system in the light of the outcomes of the parliamentary elections in the Third Republic of Poland (since 1989). He exposes especially the last element of that evolution – the 2015 parliamentary election. It resulted in the victory of Law and Justice (PiS) party. For the first time in the history of democratic Poland, the victor was able to create a government without having to negotiate with coalition partners. The success of PiS seems to be a result of the combination of several factors. It would be mistaken to portray an emerging situation as a simple rightist win. PiS to some extent represents a social attitude, typical for the socialist (social-democratic) parties, with some part of the program including a populist message, but with the combination of a conservative approach to several issues and nationalistic stand on a perception of patriotic mood. The important meaning has a support of PiS by the Catholic Church, especially at the grass-roots level. The victory of PiS and forming of the majority government have an important meaning for the functioning of the political parties’ system in Poland. For the first time since 1989, there were not balancing of power situation which the coalition governments have brought about. The political parties, creating the opposition in parliament, must offer a new strategy of behaviour in such circumstances, especially dealing with challenging the PiS policy to compromise a democratic system based on the 1997 Constitution, e.g. division of power, position of the Constitutional Tribunal and functioning of the judiciary

The analysis of the results of the elections to regional parliaments of 2018 allows to take a closer look at the current political preferences of the electorate one year before the parliamentary elections. The distribution of support for political parties in individual provinces shows that Law and Justice (PiS) enjoys constant, high and stable support, which will most likely allow this party to extend mandate to rule the country for the next 4 years. The largest opposition party, the Civic Platform (PO), sees the chances of victory in uniting further opposition groups around itself. The common start with Nowoczesna under the name of the Citizens’ Coalition (KO) did not meet the expectations. However, the distribution of support in the local government elections showed that the actions consolidating the opposition are currently the only chance to fight a leveled electoral fight with Law and Justice (PiS).