The four leaders joined BJP in the presence of party President Rajnath Singh and Nitin Gadkari, who is in-charge of Delhi elections.
Welcoming Bidhuri in the party fold, Singh said his entry has "strengthened" the party in Delhi and "no force can stop BJP from coming to power in the state in the next elections".
Gadkari said in the coming days, several other leaders from different parties would join the party as the people in general are "disillusioned" with the UPA government.
Interestingly, Delhi Congress President J P Agarwal had announced last month that Bidhuri.
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The two-time MLA was supposed to join Congress on September 6 but he did not turn up at a function organised for his induction along with popular Punjabi singer Daler Mehndi and four leaders from rival parties.
An embarrassed Chief Minister Sheila Dikshit had claimed that he could not come to the function due to traffic jam.
While joining BJP, Bidhuri slammed the Sheila Dikshit government for "high power and water tariff and the failure of the government to rehabilitate lakhs of slum-dwellers evicted during the Commonwealth Games".
BJP leaders like Vijay Kumar Malhotra and Vijay Goel were present on the occasion.
The three councillors from NCP, who joined along with Bidhuri, are Dharamveer Awana, Timsy Kasana and Phholkali Narwaal.