Notably, this happened on a day when Meena was declared one of the 18 candidates of the BJP for upcoming Rajya Sabha biennial polls. Given BJP's numbers, Meena's entry in to the Upper House of the Parliament is a virtual certainty.
Meena, a five-time legislator, along with and two other NPP MLAs, Golma Devi and Geeta Verma, joined the ruling party at a ceremony in BJP headquarters here in presence of Chief Minister Vasundhra Raje and other leaders.
BJP state president Ashok Parnami said Meena has given a letter to merge with BJP the NPP's state unit with two third majority of his MLAs.
The NPP had four MLAs in the House of 200, but the fourth legislator, Navin Pilania, has not joined the party and kept away from the development.
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"I am very happy today to return to the old home unconditionally. It is as if my 'vanvas' (exile) has come to an end.
Asked about Pilania not joining the BJP, Meena said, "It is his wish."
Meena said that he would tour the state, meet party workers and stop the Congress from coming to power after the Assembly elections.
Hitting out at the Congress, the tribal leader said former chief minister Ashok Gehlot had targeted him during an agitation in Udaipur, but Chief Minister Raje was never offended by his agitations.
The 66-year-old leader said that he committed mistakes and got separated from the BJP 10 years back but he never left the party ideology.
Welcoming Meena into the party's fold, Raje said her "strong brother has returned home".
Meena told reporters that he had discussed with independent MLA and former BJP leader Hanuman Beniwal before joining the party.
"Beniwal was positive about this development," he said.
BJP's state president said, "The party's central leadership gave a nod for the merger after which the joining took place. Meena has not changed his ideology and this is the big thing. We want to expand the party and this will help us in expanding our base."
Kirodi Lal Meena (66) had left the BJP in 2008. In that year's Assembly elections he got elected as Independent candidate. His wife Golma Devi also won in the polls as Independent and became a minister of state in the then Ashok Gehlot government.
In the 2009 Lok Sabha polls, Meena got elected as Independent candidate. In 2013, he joined the NPP and became its state convener. The party won four seats in 2013-Assembly elections.
Apart from Meena, Bhupendra Yadav and Madan Lal Saini are the other two candidates for Rajya Sabha elections.
"Chief minister Vasundhara Raje announced this at the meeting of party MLAs at the party office here, a BJP spokesperson said.