BJP leader Swapan Dasgupta and three others took oath as members of the upper house in the presence of Vice President Venkaiah Naidu on Tuesday.
Besides Mr Dasgupta, senior advocate Mahesh Jethmalani, journalist John Brittas and CPI(M) leader V Sivadasan also took oath.
Mr Brittas and Mr Sivadasan are newly elected members whereas Mr Jethmalani is nominated and Mr Dasgupta is a re-nominated member of the Rajya Sabha.
On his re-nomination to Rajya Sabha, Swapan Dasgupta on Wednesday had said that he plans to use his term to highlight issues of West Bengal and to focus on the educational system in the country.
"I am grateful to President for nominating me again to the Rajya Sabha. I hope to use the remainder of my term to raise and highlight issues which primarily concern the state of West Bengal and also to explore some of the issues which are concerned with problems and prospects of education in India," Mr Dasgupta had told ANI.
Mr Dasgupta had tendered his resignation as a Rajya Sabha MP and fought the West Bengal Assembly election. However, he lost the polls.
Jagdeep Dhankhar Spoke For 30% Of Time In Rajya Sabha: Derek O'Brien Opposition's No Trust Move Against Vice President Jagdeep Dhankhar Rejected "Blank Constitution - Biggest Fraud": Amit Shah Targets Rahul Gandhi Pics: Rahul Gandhi's Family Lunch At Iconic Delhi Restaurant Is Safe Car Enough? Volvo Crash That Killed CEO, Family Sparks Big Question "Nothing Short Of Nightmare": Woman Misses Life Event, Slams Air India Public Sector Hydropower Company Hiring For 118 Posts, Check Details Delhi's Air Quality Turns 'Severe' Despite GRAP-4 Restrictions PM Modi Meets Yoga Practitioner, Other Influencers In Kuwait Track Latest News Live on NDTV.com and get news updates from India and around the world.