54-year-old Chouhan was administered the oath of office and secrecy by Madhya Pradesh Governor Ram Naresh Yadav at a ceremony held at Jamboree ground here.
The entire BJP top brass, including its prime ministerial candidate Narendra Modi, party chief Rajnath Singh, veteran L K Advani and senior leaders of its allies Shiv Sena and Shiromani Akali Dal attended the swearing in ceremony, amid tight security arrangements. Known for maintaining a low-profile, Chouhan led the BJP to win an impressive 165 seats in 230-member legislative assembly reducing Congress tally to just 58 from 71 in 2008.
Former Andhra Pradesh Chief Minister and Telugu Desam Party president Chandrababu Naidu, who is of late cozying up to the saffron party, was also present along with industrialist Anil Ambani. (PTI)