Biden shared his thoughts in an interview with ABC's Robin Roberts.
"I feel confident that Hillary will be the nominee and I feel confident that she'll be the next president," he said.
Biden has expressed his confidence in Clinton before, saying in December she would easily win in a race against business mogul Donald Trump.
President Barack Obama has yet to take a side in the Democratic presidential primary, but has noted Clinton is leading the delegate race against Sen. Bernie Sanders (I-Vt.).
Watch a clip of Biden above.