Raje was administered the oath of office and secrecy by Governor Margaret Alva inside the premises of Assembly building. (JPN/Agencies)
The ceremony was attended by BJP's prime ministerial candidate Narendra Modi, party president Rajnath Singh, Madhya Pradesh Chief Minister Shivraj Singh, Chhattisgarh Chief Minister Raman Singh and other senior leaders.
60-year-old Raje, who belongs to the royal Scindia family of Gwalior and married in Rajasthan, has been elected to the state assembly thrice and five times to Lok Sabha.
Raje became Rajasthan's first woman chief minister in 2003 when the "angrezi-speaking maharani", a phrase used by her critics to refer to her elitist and royal background, led the BJP to its most famous victory in the predominantly rural state.
The BJP secured a landslide victory in 2013 Rajasthan Assembly polls winning 162 seats. Anti-incumbency ridden Congress could manage a meagre 21 seats.
Raje was administered the oath of office and secrecy by Governor Margaret Alva inside the premises of Assembly building.