The Supreme Court on Thursday upheld a four-year jail term for a ruling party lawmaker for taking bribes from a railway parts supplier in exchange for business favors.

Upholding a lower court's ruling, the nation's top court also ordered Rep. Song Kwang-ho of the Saenuri Party to pay a fine of 70 million won ($60,700) and forfeit another 65 million won.

"The AVT head's testimony that he gave money to Song is credible and the lower court's judgment that Song paddled his influence on what's under other government officials' duty in return for kickbacks was appropriate," the court said in the verdict.

The 73-year-old was indicted in September on charges of taking the kickbacks from the head of the local railway parts supplier AVT on 11 occasions between April 2012 and May 2014.

A local court sentenced him to four years in jail. He later appealed the ruling, which an appeals court rejected.

Song was stripped of his parliamentary seat as the sentence was confirmed, lowering the number of seats held by the ruling party in the parliament to 158. (Yonhap)