This article examines how the European Union (EU) has impacted party politics in Poland. Before the 2004 accession, party politics in Poland were turbulent. In this period, the EU, as a reference point, helped to create a pro-and anti-EU party cleavage. With this impact admitted, the article turns to the post-accession party politics. Centering on the nationalist Law and Justice (Prawo i Sprawiedliwość, PiS), the article attempts to explore the EU's impact on the PiS by studying the latter's adaptation preferences. To do so, I employ James N. Rosenau's political adaptation theory. Central to the article is the argument that since political parties are the protagonists in member states' domestic politics, the EU can only affect the party politics in Poland indirectly, but not inconsequentially. Without mandate notwithstanding, the EU can create bottom-up pressures through civil society; meanwhile, since EU norms and political parties' particular interests are not necessarily incompatible, the EU can take the initiatives to make a balance between them through policy innovations.

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