The decision was taken in a BJP MLAs' meet attended by party leaders including former chief minister Prem Kumar Dhumal, Shanta Kumar and Union minister JP Nadda.
Former chief minister Prem Kumar Dhumal proposed Thakur's name as the legislature party leader. Party leaders Shanta Kumar and JP Nadda also supported Dumal's proposal.
After being elected, Thakur thanked the party for proposing his name.
"I thank everyone, central leadership, Prem Kumar Dhumal ji who proposed my name supported by JP Nadda, Shanta Kumar ji", Thakur said.
Thakur, who is one of the chief ministerial candidates for Himachal Pradesh, had won from Seraj constituency by defeating Chet Ram of the Congress party in the recently-concluded assembly elections.
Thakur was a cabinet minister under Rural Development and Panchayati Raj ministry in the hill state.
He was elected to Himachal Pradesh Assembly from Mandi and had won his first election in the year of 1998.(ANI)