The first lady's profile on the social networking site went live Wednesday with three boards highlighting photos from around the White House, "great memories" and Father's Day.
Mrs. Obama captioned some of the photos herself, including recent shots of the Obama family skipping stones and playing minigolf, and older family photos including a wedding day picture.
By midmorning, Mrs. Obama had more than 1,600 followers on the site. Pinterest is particularly popular with women, and represents one more tool for reaching out to voters in an election year.
Ann Romney, the wife of Obama's GOP rival Mitt Romney, joined Pinterest in February.