The two-day election, which concluded today, was called to end a political crisis triggered by the center-right government's collapse.
With the votes from 98 percent of the nation's polling stations counted, the Czech Statistics Office said the left-wing Social Democrats won 20.63 percent and the Communists received 15.04 percent.
The new centrist ANO (YES) movement, which campaigned on an anti-corruption ticket, finished second with 18.70 percent. The rest of the votes were won by four other parties.