Cho won 267 of 276 votes cast during a parliamentary plenary session to assume the independent and impartial role.
It follows his selection as the DP's candidate for the role after winning a majority in an internal party vote on May 13.
His two-year term as speaker will run through May 2028.
The veteran lawmaker entered parliament after winning a seat in Siheung, Gyeonggi Province, in the 2004 general elections and has since won six consecutive terms.
During the first half of the 20th National Assembly, he served as chair of the Land, Infrastructure and Transport Committee.
As vice speakers, Nam In-soon, a four-term DP lawmaker, and Park Deok-heum, a four-term lawmaker from the People Power Party (PPP), were also elected.
Nam became the third woman in South Korean history to serve as National Assembly vice speaker. She worked as a women's labor activist for 30 years before entering parliament through proportional representation in the 19th National Assembly. She has since represented Seoul's Songpa district for three consecutive terms from the 20th to the 22nd National Assembly.
She is currently the DP's only lawmaker representing one of Seoul's upscale districts of Gangnam, Seocho and Songpa. During the first half of the 20th National Assembly, she served as chair of the Gender Equality and Family Committee.
Park is a former businessman who founded and served as CEO of a construction company before entering politics. He was first elected to the National Assembly in the 2012 general election and has since won four consecutive terms representing North Chungcheong Province.
During the second half of the 21st National Assembly, he served as chair of the Intelligence Committee.
By convention in South Korea, the largest party in parliament takes the National Assembly speakership, while the ruling and opposition parties each hold one vice speakership.
Following the election of the Assembly leadership, the rival parties are expected to begin negotiations over the allocation of standing committee chairmanships and other parliamentary posts.
Copyright ⓒ Aju Press All rights reserved.