The News Journal of Wilmington, Del., reports that Richard Hunt entered his pleas in Superior Court on Wednesday. In exchange for the guilty pleas, prosecutors dropped 22 other criminal charges.
Authorities say Hunt was charged with raping the girl, whom he was acquainted with, several times in June and July 2010.
Police say he also assaulted two women at knifepoint in Claymont in late July and early August.
Hunt is scheduled to be sentenced in January. He faces a minimum mandatory sentence of 27 years in prison and up to life in prison plus 50 years.