South Korea's ruling Saenuri party has taken the majority of seats in a parliamentary election, winning 152 in the 300-seat national assembly.
That gives the party 25 more than the opposition Democratic United Party, which had earlier been tipped to win the poll.
In a statement, President Lee Myung-bak said people had made "wise choices".
The vote is being seen as a key test for the leader, ahead of presidential elections in December.
Domestic economic issues were the top priority for most voters, but national security was also a major issue during the campaign.
Turnout was 54.3% compared to 46.1% four years ago, according to election officials.