45-year-old Kejriwal, a former revenue service official, who broke from Anna Hazare's campaign for Lokpal and scored a stunning debut in electoral politics winning 28 of the 70 seats, took the oath of office and secrecy at a public ceremony in the historic Ramlila Maidan, the fast venue of the anti-graft campaigners more than two years ago.
Along with Kejriwal, six others --- Manish Sisodia, Girish Soni, Rakhi Birla, Satyendra Jain, Saurabh Bharadwaj and Somnath Bharti -- took oath as ministers administered by Lt Governor Najeeb Jung.
Hazare and his associate Kiran Bedi, who were invited to the function, kept away from it as did several political leaders including outgoing Chief Minister Sheila Dikshit.
BJP leader Harsh Vardhan, who would be the Leader of the Opposition in the new Assembly, was the lone prominent politician to be present. Kejriwal even praised him as an honest person. Shoiab Iqbal, JD(U) MLA, was also present.
In a short speech after the formalities were over, Kejriwal said the Aam Admi Party has come with a promise to provide governance different from the one given by corrupt parties.