Earlier, the BJP Bihar unit was headed by Mangal Pandey.
Hours after Tiwari's appointment, he reached the state BJP office where BJP leaders and workers accorded him a grand welcome.
Upadhyay handed over the charge to Tiwari in presence of Union Ministers Dr Harsh Vardhan, Vijay Goel, Pradesh incharge and BJP National Vice-President Shyam Jaju, National Secretary Maheish Girri, Organisation General Secretary Siddharthan, MPs Ramesh Bidhuri, Pravesh Verma, Udit Raj and Meenakshi Lekhi.
Addressing the workers, Tiwari said the new responsibility is an opportunity to serve the people of Delhi and to give a new look to the party.
"I hope the honest and hardworking workers of Delhi BJP will be a great help in fighting against the ruling party (Aam Aadmi Party) which has come to power in Delhi by making false promises to the people," Tiwari said.
"We have to connect with the people. We have to co-operate with illustrious Prime Minister Narender Modi in his campaign to end corruption and bring total development," he said.
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