President Obama took the oath of office for his second term from Chief Justice John Roberts.
Obama received a hug from daughter Malia as Michelle Obama and Sasha Obama looked on.
The ceremony was conducted in the Blue Room at the White House.
Obama and Roberts shook hands after the ceremony.
Vice President Biden was sworn in Sunday morning. Supreme Court Justice Sonia Sotomayor delivered the oath.
Obama, Biden, and Major General Michael S. Linnington participated in a wreath-laying ceremony at the Tomb of the Unknown Solider.
A chorus rehearsed on the steps of the US Capitol for Monday’s inauguration.