Poland's conservative Law and Justice party won 26.6 percent of Sunday's Parliamentary vote following the tally of 60 percent of Poland's voting districts.
The center-right parties are expected to form an alliance with Civil Platform and replace the governing Democratic Left Alliance, led by President Aleksander Kwasniewski.
The formerly Communist Democratic Left Alliance has so far managed to win only 11 percent of the votes counted. Larger cities including Warsaw have not yet been counted in the polls.
The two conservative parties, which originated in the anti-Communist Solidarity movement, will challenge the Left Alliance, which has been plagued by corruption and voter disapproval, especially over the nation's 18 percent unemployment rate.
Jan Rokita, the candidate for prime minister of Civic Platform told reporters that "These are very important elections because they mark the end of the post-Communist era."