"By month end I will tender my resignation as BJP legislator in the state assembly and focus on building my new party," he told reporters after worshipping at Yedyur Siddalingeshwarswamy Temple here.
Yeddyurappa said BJP ministers and MPs need not attend his rally at Haveri, but interested legislators could attend it.
"Who ever attends Haveri meeting or not, I will go head with launching my party," he said.
Yeddyurappa said he would not attend the assembly session commencing at Belgaum from December five.