Rouhani, 64, a cleric considered a moderate pragmatist, replaced outgoing two-term President
Rouhani's formal inauguration and swearing-in are scheduled for Sunday, but Saturday marked the new president's ascension to office.
Noticeably absent on Saturday was former President Mohammad Khatami, considered the leader of Iran's so-called "reformist" bloc, which is severely at odds with conservative hard-liners who dominate the government. Khatami, viewed with extreme distrust by hard-liners, endorsed Rouhani's candidacy.
The ex-president's absence on Saturday is an indication of the difficult balancing task facing Rouhani, who galvanized reformist support in his electoral victory but must avoid alienating powerful conservative blocs.