Koirala grew up in Nepalganj on the district Banke. His family presented with Matrika Prasad Koirala, Prasad Koirala and Bishweshwar Girija Prasad Koirala already three Nepalese prime minister. Korala is a member of the Nepali Congress Party (NCP ) since 1954. After the king in 1960, the Parliament abolished, Koirala fled to India into exile, where he spent the next 16 years. Among other things, he was editor of the party newspaper Tarun '.' Because of the involvement of a hijacking, he was sentenced in India for a three- year prison sentence.
Koirala was General Secretary in 1996 and 1998, Vice- President of the NCP. Since 2010 he has been president of the party. In the parliamentary elections in 1991 and 1999, he won the mandate in Banke district, however, was only third in the election for the Constituent Assembly in 2008 in his constituency. In the elections of November 19, 2013 he won a seat in the constituencies Banke and Chitwan, the NCP was the strongest party. After several months of negotiations, he won the support of the second largest party CPN - UML and some smaller parties and was elected on 10 February 2014, 405 of 553 votes for the Prime Minister.