The exit poll, conducted by the research firm Ipsos, projected that Law and Justice won 43.6% of the votes.
German President Frank-Walter Steinmeier has asked Poland's forgiveness during a ceremony to mark 80 years since the start of World War II in the Polish city of Wielun. Nearly six million Poles died in the conflict.
The incident comes amid a bitter stand-off between Poland and Israel over how to remember the Holocaust.
Experts argue that the decision to pull out of the Jerusalem summit over the Poland row shows that the Visegrad countries are united against any form of racism.
The United Nations Migration Pact is the first international document to establish principles for dealing with refugees and migrants and the US wants nothing to do with it.
Poland's Prime Minister Mateusz Morawiecki comes under fire at the Munich Security Conference after claiming that "Jewish perpetrators" were involved in the Holocaust during World War II.
Defence minister Antoni Macierewicz, foreign minister Witold Waszczykowski and environment minister Jan Szyszko lose jobs as Premier Morawiecki tries to mend ties with EU partners.
Polish parliament to vote on a new government next Tuesday, and any ministerial changes are expected to be announced after that.
Subscribe to our Youtube channel for all latest in-depth, on the ground reporting from around the world.
Copyright © 2021 TRT World.